I hate spam as much as the next guy, but I choose to render it ineffective by filtering and deleting spam. Doing anything else validates your email address, making you an even more desirable target. If you truly need vengeance and really want to put the effort into it, you might want to read these articles first. Most spam is against the law in the US, but the FCC isn't putting much effort into regulating it.

Since you don't believe in karma I wouldn't worry about being targeted by even more spam once it's made public you're going after the spammers.

Spam FAQ

Sue the spammers