I'm talking among friends usually only a hundred or two on big fights. I don't have or use any apps/books. Or sometimes 5-10 per fight if I have a few people over. I also have barely missed any events in years so my bets are pretty educated guesses lol. Again, this is money I can afford to lose and is just between buddies, it's still gambling/betting though.
I recognize that and try to remember to be grateful.