I agree with several other important points you raise, but this one is not a big deal. I have a highly customized mail setup. My SpamAssassin downloads rules from the internet, but trains its Bayesian filter on only the e-mail I personally receive.
I don't mean to sound like I'm dismissing your experience, because -- well -- your experience shouldn't be dismissed. (Nobody's should.) But I do think you might be overlooking something: you already experience a significant benefit from the aggressive, God's-eye-view anti-spam efforts of Google, Yahoo!, Microsoft, and more. The things they do for their users have a ripple effect in making your own anti-spam fight a little easier.
A couple of months ago Mike Hearn wrote a brilliant treatise on end-to-end cryptography and anti-spam technologies, with a long digression on how anti-spam technologies work at Google. It's worth every second it takes to read.
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