Re: Possible BP use
Yep. that’s what I’ve built, basically, except the fee for vendors is a flat monthly one, rather than a per-item percentage. I’m actually not sure if there’s a way to do that across a multisite installation. What I’ve built has required about 70 different plugins and many customized template files to turn the vendors’ individual WP sites into ecommerce sites, rather than blogs, and to give them all of the functionality that is included with their shops sites. It’s been a huge job that has really stretched my problem solving and “out-of-the-box” thinking skills, lol!
And I’ve changed the name of my site: http://www.riotcart.com 
