It doesn't seem like there are a lot of individuals permanently banned/suspended from FT. And some of those individuals who were permanently banned/suspended are back through the "clemency" noted in the OP or seem to get back onto FT by ignoring FT rules. Comparing the two, those who have gotten "clemency" -- whether asking for it themselves or not??? -- seem more likely to be better contributors to FT, post-banning, than a banned individual with a new reincarnation on FT.