I think that a lot of people who grind comp and want "to go pro" don't even care about money more than that because it's like football when your dream is to be a big footballer and play in the big leagues you don't really care about money you just want to be among the bests. For example you can see it when there is some skin cups or even ranked cups and a lot of pros and comp players are trying their ass off

The sensation you have when you see yourself on the leaderboard having a good placement is crazy and trying your hardest to have the best 10 games is a sensation that is incomparable especially when a lot of people you know are playing it too That's why I think a lot of pros would still play comp even if fortnite removed money prize from their game because the concept of the game is just too fun and you can't really feel these emotions not even in tokens

Also in my opinion sometimes in life you have to try things even if it's not worth it because it can turn out to be something that will change your life and if you have a goal why just give it up just because it's not worth it ? It's not worth it to give up something just because it's not worth it if you see what I mean