I have a yahoo account only because I had to have it to join yahoo groups. I have all mail from those groups going to my gmail account, and I never even look at the yahoo account. There might be a lot of spam there, but it doesn't affect me. Spam does get sent to gmail, but it's pretty good (not perfect) at putting it in the spam folder automatically. The only problem is, it sometimes misidentifies legitimate emails as spam, so I have to keep checking the spam folder to see if there's good stuff in there.