I tend to agree with Mike a little here... I think the correct answer is to have a better designed theme, if you're worried about people bowing out. Also - I've had to cancel out of a draft league (before the draft), because of a family illness. Sh*t happens. How would you decipher the real problems from fake problems?
Heck, I never would join a league like this without a better design... If someone draws the 98 Yankees, and you're stuck with a team that wouldn't even cover 50mil worth of players, than that's a little screwed up on the Theme Owners part. If you're having a problem with a player consistently signing up and bouncing out, than exclude them from your theme. You shouldn't be attempting to sabotage others' reputation because they upset you by quitting.
The "this person made me mad, and now his name is on a list forever" is just kind of silly to me. There's better ways to handle it.