Max Tb for cash rewards, yes. I make the same as / slightly more than Bosen when farming Hot Legz Betty But her hits are more powerful and she has less chance of being beaten due to her tb
If you had max tutor bonus (if you are referring to stat raise from tuts) then I no lcbc's would be able to attack you because it would say defender too strong.
Yeah there's a cap on the max amount of money you can get from a battle from tutor bonus just like kaw. I dont know how to calculate the max but you can always test it to see when you are maxed.