Hello Rio_4, my name is mewthree w/armor and I own Seafoam Island (sivph.com). Even though I have not made an RPG, I have hosted two of them and generally know a decent amount about the scene. I can tell you out of the mainstream there is at least 1 RPG running (Pokemasters RPG), one ready to open (PikaClub), and one down that I host due to some issues (Pokemon Playground Arena). There are a few probably hidden in the mess to being worked on. All those are all PHP based, etc, etc. Now there are also tons of forum based ones I will not even discuss due to them now being obsolete. I am not giving URL?s as I am unsure of forum rules.
Here are some tidbits I will pass on to you about RPG?s.
1. They are system resource hogs (Reason that I booted off Pokemasters RPG) and will abuse your allowed server resources, I.E. they tend to eat bandwidth and cause mysql problems (Current problems with Pokemon Playground).
1a. From above, plan to invest in some decent either high grade shared or semi-dedicated hosting.
2. If you?re not a coding expert or better, stop now and do not reveal your RPG till you are. Also you need to have a knowledge PHP capable staff to search for errors.
3. You will be the target of crackers, hackers, and bastards. Be forewarned. Every SOB with a chip on there shoulders and basic knowledge of anything will be all over your ***.
That?s all I got, if you want to contact me over IM I can give you URL's and put you in contact with more knowledgeable people.