Loser are You because 100GB is nothing for properly hosted server. I sometimes have similar traffic leaving my workstation. Get a better link for server and don't use VPS crap, they are good only for few things.
Your logic is I should pay more to give away something for free just because some dickhole hits the shared host pipe I am on hard enough to bog down the connection for all the domains on it? Here's another 60G in two hours (from Ukrane) before I caught it and blackholed him, why don't you do the math and see how fat of a pipe I've already got?
Anyway, this guy was likely just burning through different VPN services until he got the boot or uses up his bandwith.
(more kBs of log removed)