The great thing about this job is that you don't need a degree, so while it may pay slightly less than some jobs that require a degree, this job doesn't require money spent on schooling. That's something to consider. If you had a choice between being paid one hundred thousand dollars a year or one hundred and ten thousand dollars a year while paying off student loans, you'd be better off with the one hundred thousand dollars.
Since this pays so well, I wonder how often elevators are breaking down. I've never been in a broken down elevator, so it can't be that often. If there is one truth in the world though, it's that machines will break. If you ask me, that means that if you're good at fixing machines, you'll always be able to find work.