Hosting game servers is hard, expensive work. Hosting Minecraft servers is even tougher since the hardware requirements are pretty steep and the main userbase doesn't have much money to kick into the pot. Minefold was a YC company that tried to make a go of monetising Minecraft hosting in the Right Way. They were smart guys and built a great platform, but they're not around any more. I believe it's because it was jus…
The costs were pretty low, a few hundred dollars a month, and they'd be split amongst a group of 10 or 20 people who all got a sense of ownership over their own server.
I don't really see it as a massive unsolved problem, it's the digital equivalent of kids throwing a house party - you trade a little bit of cash / effort for a sense of ownership in a community.