I have no idea how many accounts have been compromised but I don't think it's as bad as you're claiming. I suppose certain accounts could be locked but people weep like widows when their accounts are auto locked as a precautionary measure when someone tries to reset the password via the security question and they cry even more when they have to wait for it to be restored. Also, if the account hasn't posted an address or they can no longer sign a message from one then they're screwed that way and they would then blame the forum for that so we're damned if we do and damned if we don't.