Do you have a sports that you keep betting on even though you don’t watch this sports live or you don’t know the full specifications of this game?
In my case, I keep betting on tennis whenever I have spare money on my casino balance from my VIP rewards(Rakeback) after my long game session on live games. I’m not really a fan of sports betting in general but I do place bet randomly on tennis especially the Asian Handicap on live match. I’m always betting on the underdog that already has 1 set advantage to the favorite players. I do this bet just for fun no string attached.
I believe this is the literal definition of “gamble what you can afford to lose”.

Well if you are a real gambler then I believe they would be lots of sports that you actually don't watch but do place a bet on them maybe due to the fact that you have done research on that particular sports, well I don't know if this logic implies to all but for me I think I have a couple of sports like that and one of them is basketball. I have no interest in basketball whatsoever to watch but I do stake on some teams in the sports and another sports is baseball although I was got interested in a particular team which is the Yankees and this was because of a movie I watch about the new York Yankees.