What you're referring to here, how The Sims doesn't really have an ending point (which is how they can make 999,999 expansions for it and still sell them) is also true for much of the Massively Multiplayer Role Playing game (MMORPG) genre, though I suppose they still have overarching goals that the developers of those games created. However, there are two MMORPGs in particular that break away from really any goals other than those you create yourself: EVE Online and Second Life.
EVE takes place in space and has you flying around in a ship, creating or joining corporations, running the economy of the game, and attacking other corporations with thousands of other people. You can just kind of be a merchant in the game and never fight anything (though you might want protection, because others chose to be space pirates). The most famous thing to happen is something I won't describe in detail (those details are here), but resulted in the loss of over $16,000 by one of those corporations.
Second Life is some kind of free-form MMO, where anyone can add content to the game, some actually making a good living based on the things they do with it, such as creating textures or in-game buildings for a company wanting to promote something or another. I haven't actually played this one, so I don't know a whole lot about it, but from what I understand, the game is pretty well described by it's title. People just kinda do whatever, like fly around and talk to one another.
Also, this is my first comment ever. I'm very proud of it.
In relation...
What you're referring to here, how The Sims doesn't really have an ending point (which is how they can make 999,999 expansions for it and still sell them) is also true for much of the Massively Multiplayer Role Playing game (MMORPG) genre, though I suppose they still have overarching goals that the developers of those games created. However, there are two MMORPGs in particular that break away from really any goals other than those you create yourself: EVE Online and Second Life.
EVE takes place in space and has you flying around in a ship, creating or joining corporations, running the economy of the game, and attacking other corporations with thousands of other people. You can just kind of be a merchant in the game and never fight anything (though you might want protection, because others chose to be space pirates). The most famous thing to happen is something I won't describe in detail (those details are here), but resulted in the loss of over $16,000 by one of those corporations.
Second Life is some kind of free-form MMO, where anyone can add content to the game, some actually making a good living based on the things they do with it, such as creating textures or in-game buildings for a company wanting to promote something or another. I haven't actually played this one, so I don't know a whole lot about it, but from what I understand, the game is pretty well described by it's title. People just kinda do whatever, like fly around and talk to one another.
Also, this is my first comment ever. I'm very proud of it.