If memory serves me correctly, some years ago on MFC the asshole named King____ (or something) would, even after I banned him from my room, would tip me the minimum amount just so he could talk shit via tip note.
There's so much shit you had to do, as an MFC model, to be rid of someone (and even then, it's not 100% guaranteed). Just banning someone from your room wasn't enough. You had to click the ban button...the ignore button...AND block the member from posting on your wall. Or just disable your profile wall altogether, or set it so only your 'friends' could post on it.