[ErrantX]

I posted a quite similar idea (though mine had some charity donation aspects too it) here some time ago and the final consensus was that in an ideal world it would be great.

But in actually fact it wouldn't get much by the way of serious pledges and it probably is more off putting for the developers.

(I still think it is a good idea though; and sorry cant find a link to the old thread)

EDIT: found it, http://news.ycombinator.com/item?id=682450

Actually my idea was more different than I remember :P (sorry). Your is a better approach to the problem.