I've only missed one game after selling it... And I ended up buying another.
If you want to cut down grab a deck of cards. Count out the number of cards that represent the number of pins you want to keep. Put them in your pocket. Then go play your games leaving a card on each game you play until you are out of cards. You have to play full games with your best effort. What happens when you add playing games to the decision is that the games you keep for other reasons don't end up with a card. Only the fun games survive. And this way you are not picking the losers, only the winners.