Those of us that enjoy this game and sport so much. What keeps you playing it year after year.
I find enjoyment in the challenge of the game. I am not the most consistent at throwing, but enjoy trying to improve. I have alot of good friends that I bowl with that make it fun. My son just started bowling and I really like teaching him the game, watching him grow in the sport.
I enjoy watching others bowl. The PBA and College teams on TV. Also at the lanes; I will go in some nights and not bowl, just observe others bowling.
Don't think I can nail it down to one thing in particular.
The modern game is more informed with easy access to the physics and dynamics of bowling balls, lanes, lane oil patterns, shoes, grips, etc via the web. Video instruction is priceless.
Maybe siphoning through the hype makes the game interesting to me? Dunno really...
Many people think it is easier to bowl nowadays compared to say- twenty years ago. I disagree. (See paragraph 2)

Ray

"A Government big enough to give you everything you want- is a Government big enough to take away everything you have."