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It's an already made game, but it takes shitloads of work to even actually set it up, not to talk about keep it running. Not to mention that it costs like 80 € too. You have to put in all the moves, characters, items, what functions the items have, how things interact. Even when using a ready built game engine to create a game, its several months worth of work.
Creating a simple math program where you have x and y which are 2 random numbers between 0 and 9, and you have a textfield, where you input the answer for x*y = " " is around 400 lines of coding. And sometimes the code is wrong, and you have to find out what is wrong.
Creating an RPG game, turn based or not, would be like 1 million lines of coding in java, at least. The "login" screen alone would be around 2000 lines.
Writing that much code, and getting it to work properly, would take over a year for 1 person.
(The numbers are rough estimate). 2 person -> 6 months. 4 person 3 months. Too many cooks in the kitchen spoil the soup.
(I'm counting up to 3 hours a day)
I don't think anyone would want to put that much time and effort into something like that. If you want it so much, I suggest you learn Java or Flash, and do it yourself.
Even using a ready built engine, it would require a lot of time, money and effort. Time, money and effort that could have been put into more important things.
It's not a bad idea, but neither is wanting 1 billion dollars.