I have to confess I'm not uploading many photos anymore. The lag between upload and images being visible makes this site much less interesting.
I have been, instead, uploading anaglyph and stereo-crossed images to Instagram and / or StreamZoo and they are immediately visible. Plus this is exposing mainstream 2D image 'consumers' to 3D content. The response has been very positive.
In the past, I've suggested a 'Trusted' user status that might be given to paying users. Their images appear immediately and they promise to not post adult objectionable content (or they have the option to flag it themselves - performing their own moderation). If they violate this (perhaps '3 strikes" in 6 months - assuming self-moderation - as people sometimes make mistakes....) they go back to being moderated like everyone else.
This would reduce your work load and give people another incentive to become paying users.
This would certainly make the site much more 'alive' for me.