However as another commenter said, any game can become work if you want to achieve perfection. For example if you play an FPS game you can always shoot faster and more accurately - if you practice more and more. This can lead to a point where you don't find the game fun anymore.
It was either make an imperfect solution and let it run for a hundred hours, or spend a hundred hours optimizing a perfect solution and then letting that run for ten more hours, or something like that.
At that point, I just tapped out. Building my factory just stopped being fun at that point.
there is no exploring left in runescape, for the most part - virtually every corner and easter egg is effectively documented or reverse engineered in some way.
Been playing MMOs since 2003 and in top raiding guilds/corps/etc since 2005, where this was highly rewarding.
Going without a computer (motherboard died) and having to quit MMOs for a while for economical reasons made me enjoy some single player games and heloed me fix this somewhat.
Does this apply only to certain (kinds of) games? Does it come from the way the game is structured?
Or does it have more to do with the community around it? For example RuneScape these days seems to be all about optimization, while back in the day it was more about exploration. (I guess for people who are still playing, there's nothing left to explore...)