ok, look, no guy is making 1000$+ a day at 50nl, its just not happening. As someone else said, he would have to be running something like 80bb/100, which is just not possible. You cannot substain those numbers. 30bb/100 would be amazing if someone substained it.
Im not calling you a liar, but maybe you are missing something, like someone else said hes probably using the rebuy trick to get a bigger stack. But I promise you hes not clearing 1000$ a day at 50nl.