The "lulz". Quite simply it's attention whoring at its finest.
A guy was tazering me to death yesterday. Then blowing rockets from his car, oh and he had muscles like Arnold. Finally he jumped into a bus that magically appeared and he flew it through the skies. I just smh...WTF do you want to do sh*t like that for?! And what's the point in being able to kill everyone and you dont take damage?! It would get boring FAST killing everyone knowing you cant be killed...what's the point?!
People hero worship them or they villify them, but at the end of the day they are on everyone's mind with every post/thread made about their exploits, which is what they want...attention.
It's not about making the game better or more fun, if they were interested in that, they'd work on their own version of heists and fix the freezing.