Willing to pay for new features?

[c0urier]

Sounds to me like a good idea, this is used within many projects also known as "Post a bounty" - 1 Guy makes a request and places a bid, more users join the request with the amount of money they have to spare. The creator makes sure the developer is payed by collecting the money from the different users/bidders. And then doing an overall transfer, it could also be an option that all users just directly transfers to the developer, probably more fair.