I don't think this model has been banned. Isn't it services like ad.ly who are paying users to tweet out ads. FeaturedUsers is a service that is like an adwords model which allows people to advertise their Twitter account.
Why Sell It?
I have a grand vision of where I believe Featured Users can go, but I'm ready to move on and focus on other projects. I would like to see someone continue where I left off.
Who Will You Sell It To?
Not just anybody! Like I mentioned, there are over 35+ sites in this ad network and just as many developers (myself included). I intend to continue using this ad network on FriendOrFollow.com after I've sold it. So, the new owner must be just as passionate about taking over this project as I was starting it. If you bid, please be prepared to explain to me why you would make a good successor.