[jlgaddis]

> but I still get disposable emails, which is kind of aggravating.

From the other side:

So is giving up my e-mail address to receive something, knowing I'm going to get e-mail later about other things that I don't want (a.k.a. "spam", to some people).

I run my own mail servers, though, so I just create a new alias for everything, such as these one-off "give us your e-mail and we'll give you x" offers. I generally don't delete them afterwards, though, unless and until I start receiving other unrelated e-mails. Then, they get deleted (technically: timestamped and marked inactive in the database) and after a year they "reactivate" and become spamtraps.