Board Thread:ROBLOX help and discussion/@comment-25292598-20140821221926/@comment-8573338-20140914070721

You do not have to pay money to host a Minecraft server, but about everything else, you're partly correct. They DO need this money to pay their employees and players through DevEx, but they're not going to shut down because they didn't add price floors. Servers are expensive, but giving people several thousand dollars for making lots of virtual money probably costs more.