system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek TNG] What did the bridge officers do with poker chips they won? Could they convert them into anything worthwhile (maybe not money but favors from each other or something like that)? Or were they always completely playing for fun/for no real stakes?

There is an episode where at the end of a poker game Riker bets all his chips to Data that he can find Data's card (do a magic trick). If the game is over and the chips are useless why do they even care about the chips? After Riker's attempt to trick Data fails, Data takes all the chips, as if they're worth something. But why bother?
gpt
Some crewmembers will set up systems where they trade shifts or holodeck time and whatnot, but most of the time, and particularly for Riker and the gang, the chips are just a way to keep score.  
They bother keeping the chips for the same reason folks try to set the high score in any kind of game.  Competition is fun, and it's fun to know who's ahead and who's not.