"I have had a Premium Membership for a couple of years where contractors would pay for a "directory listing" that generated leads for them on the main domain of the site (my Ning site was a sub-domain of the other) BUT I've never had a way to offer different benefits to the social network side of the site like I can do with my new Jamroom site. The quota system allows me to do this: Premium Members will will be able to upload larger picture files, unlimited videos, more pages , customized profile tweaks and more. . . "
Andy Franklin