For BioShock Infinite - it's finish the game! For other stuff, it might be a finish the game, or a "this was so horrible I felt like tearing my eyeballs out".

Perhaps long term, it will be a thing that sees me do some in depth analysis on how many ferraris I might own had I not purchased all these games that are perhaps not to my liking. It also gives me a focus for gaming, instead of an overwhelming sense of "what do I play next?"

Doing it alphabetically lets me do it with purpose!