I've been thinking it’s somewhat unfair that the GM is pretty
much solely responsible for having all the art for the games they run and that
players have little incentive for buying art assets or membership levels. A way
I thought might be helpful is for a GM to be able to pull art assets out of his or her
players art libraries, probably with a flag saying whose library the asset is
coming from.
You could limit this to only marketplace purchases for free users, and maybe a
mentor or subscriber feature for full libraries. You could also give players a
flag on the campaign main page allowing them to opt in for sharing assets.
I think this would spread the burden of costs around for long running groups,
and also give players and GM's the incentive to purchase items they might see
in one game so they can use them in others.