The main issue is that there's a total lack of goal post to "return home". There isn't some kind of lofty mission placed in front of them with a promise to return home or hints of ways to travel to other worlds or just "log off" from the game somehow. People can't really dedicate themselves to something so vague. I don't think that part is really odd. I think the main issue was actually their initial reaction, not how they followed things afterwards.
There's no goal post, sure, but they figured out how to make food taste like food and how to build stuff. It would be nice to see them at least try to get out of the game. They don't seem to bothered with that at all so it kind of breaks my suspension of disbelief.