Highest converting audience for email marketing

Who are the people that are most likely to click a link and enter a giveaway in exchange for there email.

Any help would be appreciated

Thanks in advance.

stupid people ,those who turn out to be very hard to identify on the internet.

A targetted list?

If you're doing sweepstakes or those "enter your email to win an iPhone" offers, then you can get general internet traffic (that's what it's called) but most of the time you'll end up with a bunch of "tire kickers" on your list that don't spend $. Either way, you can still make a healthy profit spamming CPL offers