Chances are they have already gotten more than a cent from you – depending on what they do with your account data. Even just an email address has a price. That’s my only point, really. Just signing up gives them something.
Well if they can turn fakeaccount53643@yahoo.com into money they honestly deserve the 50 cent they’re getting for it.
The point is that an email address that is not in use except once to create that epic account is worthless to whoever buys it.