I don't really like being forced to give away my email just to try something blindly. Many times it stops me in my tracks, and I just give up on whatever the new thing is.

When I do give my email address out, it's my gmail address. I only check it a few times per month, sometimes more often if I'm in a project with someone. I've got 8,002 unread items littering it, so any marketing, etc... is just going to get ignored. Like 99% of all email (after the spam filter!), it's not really important to me.