I don't think posting in the forum has anything to do with contributing to the quality of the gallery... and I don't necesarily think that the same people who would find the gallery useful have the time or desire to hang around and talk about which "animes charichters they cuz be if dey wantztezt to" >_>;
If there is to be a reward sytstem... there should be a way to accumulate merit for the gallery BY PARTICIPATING IN IT.
The forum should be something folks participate in because they WANT to... not because they are bribed.
As for the "anyone can see it" issue. Right now, anyone, member or not, can browse the galleries and take the material there. If anything, we should be requiring membership to access ALL galleries, before worrying about hiding just a handful from those who haven't been here for over a year.
If one thing's for certain, it's that no-one's going to be sticking around that long if they don't have to join at all...