2 pages or 20+ pages?

Hi WA members!

So I've been here about 2 months now. I'm almost done with Kyle's Certification Courses, I've spent the last few days reading through a lot of Steve's (IveTriedThat) training (excellent stuff if you haven't yet checked it out you should) and listening to a bunch of Jay's (magistufios) Webinars, including some older ones that Steve recommended. All really good stuff!!

BUT now I'm a little confused and I'm hoping someone can help clear things up for me.

So Kyle and Steve both seem to suggest that you choose a niche and write content, lots of content. Your website is never finished, you should blog at least 2 times a week and by doing that google will find you, see that you are serious and hopefully start ranking you. Okay cool, makes senses.

Now in some of Jay's webinars when he talks about choosing a niche, its more about choosing a specific product. For example Lighted Kindle Cover or Xbox wireless controller. He then goes on and builds a website with only 2 pages. No blog, no comments. Just one or 2 pages about the product, promoting and reviewing the product and then encouraging the reader to buy it at amazon or someplace similar. So how does this get ranked if you aren't continuously adding content? Because if I'm understanding some of Steve's training, he says that if you aren't adding content google may think you aren't up to date and therefore not rank you.

So I'm just wondering, why? what's the difference? Am I missing something? Am I not understanding the training's correctly? I'm just a little confused. If anyone could shed some light on this for me I'd really appreciate it. Thanks!!

Jill