Having personal experience selling video games in the eBay market, I can tell you first hand that we made minimal margin on new games and we were dealing wholesale. All out best margins came from used games, which we also purchase in volume. Knowing how hard it was to make any money at all on new games and the sort of cash outlay we had to make to make such minimal profits, I can't imagine any dropshipper that would be able to give you a price that would even come close to allowing you to compete on eBay.
Just a personal opinion of course, but I really doubt that idea has any legs for you.