Why do spammers try so hard to avoid anti-spam measures in order to contact the people who are least likely to buy anything from them?

Yes, I know that large ISPs and webmail services have lots of anti-spam measures, and that they're the target audience, but really can't they realise that sending me 6000 spams a day isn't going to change my mind? I'm not going to suddenly think "Hey, I've got a spare afternoon, I'll just go through my inbox and see if there's anything there I can buy." They should just start up a serious opt-out scheme - if I don't want your spam, I'm not going to read it even if it does get through.

I'm a little screwed now work-wise. Didn't wake up till 11.30, I have three activities left to do by tomorrow (after the 4th-to-last one took me over 3 days), and when I'm ready I'll be driving home so that's another 3 hours I don't have. So I figured writing a diary entry wouldn't really make that much difference.

Thank you for the comments on the last entry by the way :)