It looks good to me...

Yeah, great one. Most people in network marketing are ordinary people suddenly pushed to the real world of business. Some experience quick success, while others struggle. Those who achieve dramatic success, are sometimes not ready to handle the sudden flow of cash, so I think, that service that you're thinking, has a market inside the network marketing industry. If you know it well and you're willing to work hard for it, then good niche for you.

It is a potential niche.
It's even better if you have success stories in the network you have joined. All the people that sign-up as a member of those network program will be your downlines.

Or is it going to be a site offering training on network marketing?

There is potential...

Joe

Sounds like a good choice.

According to google trends, both multi-level marketing and network marketing have consistent searches over time.

Go to http://trends.google.com, and search for both terms "network marketing" and "multi-level marketing."

From the 5 year trend you'll see it can be a sustainable niche, people are always searching for these terms, and if you write a lot of keyword based posts on MLM and NM, given your first hand experience and knowledge, you will rank. Add some affiliate links to alternative programs like WA and products and courses in finances, and you will be making a full-time income.

Bless

I think this is a very good idea. Certainly an interesting subject and you should be able to right about a lot of aspects within that niche.