I know if your user name is the same as your email address, you tend to get a lot more scams. I changed my ebay user name and I rarely get them anymore. I've noticed that my comcast junk filter seems to filter out about 1 of them a week though.
I wonder if anyone has a user name of firstname.lastname@example.org
that would be pretty funny because the scams would get emailed right into the proper place =)