Charon121: PWYW bundles can be combined with GOGmixes. People create their GOGmixes, others vote for them. At the end of each month, the GOGmix with the most votes is on a promo, and its creator receives all the games in it for free (or the monetary equivalent of any other games, if he/she already owns them all).
And when the right holders of the games start writing GOG testy letters asking why they've decided to give away their games for a cent?
I mean, it's a cool idea, but I don't think it's feasible; the publishers have their rights, too.
(This is also the reason that every time GOG gives away a game for free, and people ask if they can get a
different game for free if they already own the one, the answer is always no.)