Looks like nobody answered so I'll give you my input.

Can it work...Yes. The concept makes sense, but the effort required will take years...and I don't mean a couple years.

I often run this concept through my brain but also realize the monumental effort required.

You are most likely flying solo, and this type of task can easily overwhelm you over and over and over, making you quit.

Unless you focus on one aspect and build it over time.

This way you can see successes at different points, and make money along the way.

I'd love to hear more about your thinking on what you are specifically planning to do, as the question is as general as building this type of site.

Even if you decide to do this, you absolutely MUST learn how to sell each and every product you plan to promote.

Can you catch a lot of fish with a large net...of course...but what if you catch nothing but Marlin and swordfish, and everyone wants to buy Tuna.

-Brian

I totally agree with the comments posted so far that is it is easier to do focused small sites and build articles and links around each. However if you have the patience and desire the larger site will eventually end up dominating in Google. The large site will take discipline and DABK is right do it one piece at a time and make money as you go, otherwise staying motivated will be your problem.

Not saying it cant be done but you got some work on your hands if you do decide to go ahead.
There are some other things to consider too before jumping. Consider what you want to deliver, imagine what a browser will see when they land on your site. Consider how YOU will behave. Go to a similar site pretending your a regular customer and note how YOU behave.
Also think about how google will "read" your overall website, I think that may have a influence on your rankings but do double check that.
Do keep in mind though that you WILL be sluggin away at it lol.
I have a similar idea about an "authority" site I have in mind and have bought the web address for but its specific to a topic.

I prefer niche focused WP blogs with exact match domains, 5-10 keyword optimized pages. And keep building and adding more. My goal is to have 50 of them and then go for the 100 mark. This gives you the option to flip any you get tired of or can't keep up with. Your model will work and may be a better idea for the long term if you stick to it. As with any marketing approach, you have to do the work. Hey... wish you the best!

What are your resources? How much time, patience and money do you have?

Because, though it's a great idea and can be very lucrative (viz. Amazon.com), it takes a lot of resources to pull off. Each niche you add would have to have subniches. Each subniche would have to have keyword optimization.

How about you start a site about pink shoes for left-handed people on a relatively broad keyword, like 'pink shoes and other sad things" and take it to the top, make it make you money, then you add the next subniche (pink shoes for right-handed people). You get that one to make you money, then you add your next niche: blue jeans that go with pink shoes. Then twill pants that go with pink shoes. Then white shirts that go with twill pants that go with pink shoes. Pretty soon you'll be at Yamaha Super Tenere and low sodium Chinese noodle recipes. But you will have made money all along.

First, thanks each one of you for your input and the reasons supporting them. @jonniki, I understand what you mean about being all over the place. I was just pulling niche's out of the air with my example. My intention is to create a landing page for each niche' and create subpage for that landing page like a blog, review, etc. I will only work one niche at a time. When that is completed including back links and articles, I will move to the next. Hoping to only have to update blogs while working new niches. What is your opinion on that? @jatdebeaune, I will take you up on that pm. @you gotta have faith, when you said, ""on page" were you referring to the landing page? If so, I was planning on having individual landing pages for each niche'. Have you heard or read anything regarding that? please let me know. @slugger_mn, what do you think about the individual blogs as subpages idea? I was just thinking it would make it easier to update new content for the individual niches'. Would you suggest using wordpress for the entire site? I have html training, but like math if you don't use it you lose it. I gotta get the wheels to turnin' again, lol. Please advise. You guys are great! I'm ready to make some money!

It's exactly the format I used for my site early on. I still believe in it as a good way to go. However, it has been very difficult to pull off. What Slugger and Joniki say, both accurate. I was told by a well known marketer that I must be a masochist, because one product sites are so much easier and more profitable. She was right. Here's what I've encountered: people think they're shopping when coming to a site like this. They have a good time and leave. You have to direct them to one product and convince they they need it. Have to buy it. Only way you can do that is by creating sites within the site. It is HUGE work, even if you have a team. I'm doing mine almost solo. My sister writes some of the articles, I do the rest. It's an incredible amount of work. I'm about to re-design it with the benefits of what I now know. Google will love you, because it gives juicy content, just what they like. But you want money for such heroic efforts. Feel free to PM me if you want.

These sites do work well if done correctly. The problem and reason most do not recommend it for new people is because you tend to do exactly what you described your site being about which is all over the place. When new people create these kinds of sites they tend to not spend enough time supporting each area of their site before moving on to something else. The end result is a giant site with no traffic because the sheer amount of supporting content and back links becomes overwhelming to keep up with. If you want to create this type of portal site you have to be very disciplined. Pick the first niche and stay with it until you are driving traffic and sales before moving on to something else. Doing it this way will, as Slugger said, result in pages down the road getting indexed faster and listed high in search results.

This is just my opinion based on what I see many more experienced marketers here teaching, but although you can do it this way, it takes longer to get ranking power because your "on page" info is all over the place. If you're anxious to get going it's much easier and faster to get Google love by have a tightly focused .Com. Just the way Kyle and Carson teach it in the Success In 30 days...

If done correctly this is a good idea. Consider this a blog though, and each topic will need its own page within the site, then just push up the article, or page under the correct keywords on google. What will happen is this, over time google WILL fall in love with a site like this assuming the content is all original. Then every time you do create a new page, it will get indexed where you want it very easily and fast. Some of my sites like this are loved by google, and I can post an article about anything I want targeting any keyword I want, and within minutes, the article is indexed and receiving traffic from the keywords I targeted. As long as you know your sites power, and use it accordingly, this is a great idea.