In this time of E-sports, competitive card TCG gaming and various other commodification of geek pastimes, why would running a game be any different?
It's not like this is new. Paid DMing has been around for quite a few years, even if it hasn't been all that popular. Granted, I've never done it but, I can certainly see why people would. Imagine if you're in a pay group. That means that players actually show up on time, because, well, they're paying for it. It also means that people are a lot more literally invested in the game than someone who just comes for free. I can totally see how a pay group would be a pretty good experience. Plus, with a pay group, because the DM isn't your friend, but, is there to provide a service, if Dave over there is a stinky gamer, or is disruptive, or a jerk, boot. Gone. When it's a pay service, you have a lot more power over the table and a vested interest in making sure that the table is happy.
How is being a paid DM any different than any other hobby where someone makes it a business? We don't have a problem with someone writing a module and selling it. So, why is selling my time a problem? It's my time to sell and someone else's to buy. If you don't like it, there's absolutely no reason for it to even appear on your radar.
I mean, good grief, what's the difference between a paid DM and someone who makes streaming live play videos and tries to monetize their game that way? I really don't understand anyone having an objection to this.