Well, quality naturally is somewhat in the eye of the beholder, but with a committie voting on it I think you can pretty much be assured that the standard will remain pretty much the same throughout.  Individual opinions might vary somewhat but get a small group together and your results will be fairly uniform.

Also, once someone has acheived status as a revenue sharing member they wouldn't need to worry about their submissions being judged unless someone reported them for uploading a bunch of less than quality submissions, in which case the committee could review it again and see if their was a big difference in quality between their original submissions and there new ones.  It would be pretty easy to spot the spammers in something like that, and if you catch one they lose revenue sharing status and can't regain it for a long time, perhaps as much as a year.