I'm talking about games that only had a cult following but by today's standards were largely unsuccessful. Another one that comes to mind is Asheron's Call. ~8 servers, with peak load ~3000 players per server. I played that game more than any other to date, and most people have never heard of it. I think the learning curve turned most people away but it had a pretty unique world that I found much more fun to explore than, say, WoW. Also they tried to compete against Everquest when pay-to-play was not very common, and everyone that wanted to was playing EQ.