[cflee]

That is really great if you don't have any outbound deliverability issues due to IP reputation on a VPS host! Under those circumstances, that sounds like a great arrangement.

I think that is not quite the norm, lots of these hosts (and home internet connections) tend to have rather bad reputations, and chasing down the various RBLs can get really old really fast, especially since the most common response is to silently blackhole so you don't get a bounce.