This is a surprise to me. That so much of the Spam is initiated here is disconcerting, because we should be able to do something about it. More needs to be done to tie the money stream to the spamming. If it is a particular affiliate stream then the pressure needs to be brought down on them to tighten things up or face consequences.
Ultimately the problem with spam will only go away when people stop illogically being enticed into doing things because of it. Unfortunately spammers need such a small return on their mailing that it only takes a miniscule fraction of the population to fall for these mails to make it cost effective,
I honestly would have thought at this point almost all spam originated outside the US, so like I said I found this a bit disturbing.