Second hand gaming sales...it probably kept most gaming retailers alive during the recession, so it in fact, did not lose any more. Think about it...gaming retailers COULD have gone bust if it was not for second hand sales. Then these developers would have no where to punt their games to us.
I do see some logic in what these developers are saying, they are losing out on some sales (not billions, though). But at the same time, many new players are exposed to their games, which is a lot better than if they sold the same amount of games brand new to players and no one (read second hand buyers) else played it.
If people are exposed to your games, you can accumulate new fans, which in turn, will boost your sales numbers for your next game.
Stop complaining. Or I'll buy another one of your games second hand.