I support the "Increase bets" idea, within a reasonable ammount to be increased, just as Lazors said. If this Increased ammount is not controlled, people would take advantage of it to have a minimal tc loss.
For instance: I have an enormous ammount of toricredits on my account, but I don't want to make risky bets. I will always bet 100tc as the match starts
-If the player I bet 100tc on does very good, I could increase the ammount of my bet to whatever I'd like it to. Thus, taking advantage of the non-controlled Increase Bets system.
-If the player I bet didn't do any good, the bet would keep 100tc and I would have a minimal tc loss.
I do not support the players canceling their bets, though. Operators can do it manually. And recently, TBradio managed to create a bot that automatically cancel all bets if the counter is any lower than 10%. If players could cancel their own bets, no one would ever lose/win TC betting.