I voted "other." I am assuming that I would be a very talented professional GM with a strong enough reputation to convince people to pay to be entertained at my table, and that I would be charging the players directly. I'd charge per person and therefore the per hour take depends on the number of people playing - I would be providing an evening of quality entertainment to a small group of people. As near as I can figure, going to see a movie comes out to a cost of about $3 per hour per person, not counting the overpriced popcorn and soda. That is about the only form of out of house entertainment that I regularly have experience with so I'll just go with that, though I suppose the theater and opera are more expensive, as are ridiculously overpriced rock conerts. An average group of 5 people would wind up collectively paying me $15 per hour. A large-ish group of eight would pay $24/hour.
Unfortunately, if you consider the prep time for each game, expecially if it is done very professionally, the hourly rate that I would see for the amount of work that I actually put in might be less than half of that. As a result, I would no doubt promptly start seeking some other, more lucrative line of work.
Which brings us to the question of how much players would be willing to pay for a professional GM, and how many people would be willing to pay anything. Unfortunately, the answer to those questions are probably close to $0 and 0 people. I've even heard of people wanting to charge for GM services in a few contexts, but as far as I know, none of it has ever gotten off the ground.