Q: What is the difference between a commercial and a free mmorpg ?

A: a free mmorpg means that you do not have to pay for play. A commercial mmorpg like world of warcraft will cost you a monthy fee between 10$-25$.

You can find The Sims private server and The Sims MMORPG server. Massively Multiplayer Online Role Playing Game. They are played with other players. The point of RPG is to materialize into your character. MMORPG can be played by thousands of players. We have some of that The Sims private servers in our top mmorpg list you just see as top 100.

Massively multiplayer online role-playing game (MMORPG) is a genre of computer role-playing games in which a very large number of players interact with one another within a virtual game world. Many MMORPG games have a monthly pay. If we won’t pay every month, we won’t able to play the game. We can pay in few ways – by credit card or going to a game store and buy card. Then in our games website, we have to enter cards code.
As in all RPGs, players assume the role of a fictional character (often in a fantasy world), and take control over many of that characters actions.

A free mmorpg works like a free game. You can play for free but often you can buy items in a so called item shop.
MMORPGs are distinguished from single-player or small multi-player RPGs by the number of players, and by the game persistent world, usually hosted by the game publisher, which continues to exist and evolve while the player is away from the game (afk).