Yup. Folks like to bring up Roblox (rightfully) with regards to gambling and hosting shady real $money shops for in game items but AFAIK (public) Minecraft servers have been doing this since at least 2012. "Pay $20 for a 'rank' on our server! You get extra goodies!". "This special diamond sword is only $1!".

Really an under reported stat imo. These servers are under the radar.