2011/10/7 church.of.emacs.ml church.of.emacs.ml@googlemail.com
How about making a free version and an (identical!) "Support Wikipedia" version that has absolutly the same features, but costs $2 that go to WMF as a donation? :) Why we should do this: It's an extremly simple way for users to donate money. No entering of credit card or bank account information necessary, just select one app instead of another.
This would be pretty straightforward to do, I think.
Very rough estimate: 20M total downloads, 0.5% download the "Support Wikipedia" version for $2, that's $200k.
Note that the app-store middlemen take a 30% transaction fee, so we'd get $140k and Google or Amazon (or Apple if we do an iPhone version same way) gets $60k. 30% sounds high but probably isn't much worse than individual $2 credit card payments. :)
-- brion