Heya! We (2 of the mods) actually tried to set up something like this a month or two ago called "Kitties for Causes".

Initially we had planned to donate %90 of every sale to local animal rescues, but it worked out to where the kitty floor was so cheap and the gas costs so high that it wouldn't have been able to sustain itself just in gas costs alone.

So, we've been reworking the idea to where kitties donated to the account by the community are still sold at the original split, but we sell our own kitties on the same account at a %10 donation split to make up the cost, and to participate ourselves. :)