The indication is that you don't think that you will get a good hit with the bat.
No. Seriously. I have never seen imperical data related to the life of the bat. I expect that there would be a certain amount of metal fatigue that occurs when metal is repeatadly bent in the same place. Since todays bats are designed to "trampoline" or have a controlled crush to rebound from it is reasonable to assume that the ability to rebound effectively will diminish with use, thereby, leaving a 'softer' feel when hitting a ball.
Interestly, my son swears that he has to break a new bat in before he says that he gets good pop with it. By the end of a season he says that his bat is losing pop. (I don't know, maybe he is losing his pop.)
It would be cool to have a physics prof investigate this question and publish results.