It also extends their careers at the cost of some young, up and coming kid who can't get his spot in the UFC because the old timers won't leave. If your body can't deal with MMA any longer, you're not supposed to do it.
I disagree, your not supposed to do it only if you start sucking or you have no chin anymore ala liddell, wandy etc. I for one want to see Dan Henderson continue to compete for as long as he can and if TRT makes that possible then so be it. Also If I kid can't get a spot in the UFC anymore it's because the UFC has been adding too many stupid weight classes filling up all the spots and former bellator fighters are getting sued instead of getting to fight in the UFC. Also i'm sure if you can't beat a veteran just because he is extending his career then you shouldn't be in the UFC/ a top fighter for that excuse.