It seems as if it might limit itself to small-scale funds: lunch money, petty cash, spot-you-$4-for-fancy-coffee -scale... and then one considers the buying power of a determined fandom, and one quails at the thought. Though the fact that DW points are not a currency that can be readily converted to offsite cash makes some of the screaming horror diminish.

The other belated-realization insight of the ways this could go wrong -- I know that on LJ, pay-to-become-a-member communities are amazingly against the Terms of Service. Something like this would make that easier, although it could in theory already be done by transferring points to an admin.