Doesn't this assume the profit you gain from kN users donating X/k price on average, given free content, equals or exceeds N users paying X price, or something like that? Of course this is a gross simplification, but how else does it justify making something free and expecting increased exposure to make the operation sustainable? IIRC Wikipedia is not looking good financially, and there is probably nothing with more eyeballs at the moment.

I'm guessing you have thought though this situation much more thoroughly, and maybe have data on it too; otherwise, I'd be very surprised if things work out so ideally.

> the increased eyes and ears on content

Those eyes and ears were supposed to be looking at ads, where more impressions equals a happier advertiser. It isn't obvious how that extends to donation-ware, when everyone can just move on to the next free source of music.