Honest ponzi schemes don't strike me as particularly evil. I don't know why people would want to play musical chairs where the operator gets most of the profit for no real contribution, but knock yourself out. It is like casino gambling in that the house always wins. I see a case for a subforum to distinguish it from spamming up "real" gambling, but it doesn't intrinsically bother me much.

Compare that to the many dishonest de facto ponzi schemes I see advertised here: https://bitcointalk.org/index.php?board=159.0