That's definitely an option, but there are some missing elements doing it that way. Payment should be held in escrow so the developer knows the money is availa

That's definitely an option, but there are some missing elements doing it that way. Payment should be held in escrow so the developer knows the money is available and the requestor knows he will get is feature before the funds are released. It would also be nice if funds were released automatically when the issue is closed, and that paid issues cannot be closed without approval from the user paying for the feature. Also, in keeping with the spirit of open source, developers could/should only request payments on feature requests that the developer doesn't benefit from.