I'm more the type to start a game but rarely do I see one to completion. Trophies are cool but they hardly give me an incentive to continue a game once I bore of it.
Same for me. I can actually start a game, play it for 30 minutes and then move on to another one and repeat the process. If I played every game to 100% before I moved to the next I would never play another game after starting the first.