Are you fucking stupid? They want high quality posts, not picture threads which are only used for boosting post count. Please don't pull that "pictures are worth..." shit, too. >_>
Yes, "they" want high quality posts, but "they" are not the owner of the member's posts. Everyone posts what he/she sees fit.
Those pics are actually quite nice too
Yes, the difference is that "they" are paying him, and that "they" set down the T&C's for the ad.
"They" = basically all sig advertisers