[mabcat]

I do the separate-email thing too and my spambox is chock full of emails to leaked addresses. The leaks seem mostly from large, upstanding companies that have had data breaches (Adobe, Myspace, ...), rather than from deliberate email address sales. It's still very handy to be able to just disable an email address... can't do that if you've used the same registration email on 1000 sites.