I see that Giolon has observed some inconsistencies in the rules,

I've had gallery images pulled for thumbnails that showed less boob. 

Out in the real world, the rules can be even stranger ... I know of an instance
where a store manager has been charged with obscenity because of some
promotional murals ... one of the confiscated images showed just a little of
the side of the model's breast. 

Are the rules more lenient for the ones who are making the site money?

Sorry, that's too complex a question for me to answer. 

In any case, you might want to read and join this discussion thread, 
"Censorship v. Advertising v. Art? [nudity]" ... please bring 'Tanya' along for show and tell. 

Comments ... Please ...

--
Martin