Also. Vps $5 / month is $60 per year. So yes go ahead and run your own but pay _more_ than my $50 per year service that is handled for you.
Luckily, the paid e-mail provider space today isn't as deserted as it seemed a few years ago, so I'll ask about that instead: Why would I go with you instead of a reputable competitor in the same price range? (I pay about the same for e-mail currently)
There are reasons to pay an email provider $50/year, but I don't think being $10 cheaper than a VPS is one of them. You have to provide something beyond what one can get with a VPS.