Exactly this. And ontop of that, it blows my mind that people will buy used instead of new to save a couple bucks. Just saw that the used version of GoW at Gamestop is far ahead of the closest new version. And the kicker is that the used version costs $58.
I buy a lot of used games for between 50 cents and $5, so I'm saving a substantial amount of money. In any case, the developer doesn't directly make money off of sales anyway to my knowledge, the publisher pays the developer.