The other thing that always felt off to me about Michael's theory that the Bad Place was messing with the system is that if they were doing that, he would likely know about it. He was a valued employee there for long enough to be in the loop on things like that. Given all the reboots, he tortured Eleanor and company for hundreds of years. It wasn't until very recently that he switched over to Team Cockroach. So it would make sense for him to be aware of any messing around the demons were doing with the points system. So this explanation makes more sense, in addition to being more complex and more interesting.