Essentially a man is role playing as Olaf, a homeless nord with no magical or adventuring skills; the player has set himself rules that he can only earn money through lawful legitimate means. He cannot murder or steal, his ambition is to become rich through farming, mining and hunting animals. Another interesting tidbit: he also has to eat three meals a day and sleep at night.
So it got me thinking, would a game centred purely on this concept be fun? It'd be like The Sims in a way, you're just a normal person living an ordinary life. You can't do quests, you aren't powerful enough to fight more than deer and you have to make a living in this fantasy world.
Maybe you can help heroes who do real quests by smithing them weapons; if you get enough money you could open a bakery or something. You'd get effects happening to you, like if you do not sleep you could pass out, not eating weakens you and you may die; you thirst, maybe have relationships?
Random events could also be interesting, so you are affected by the world around you. For example if there are two warring factions, the enemy could come in to slaughter the villagers (including you) but you're too weak to defend yourself from more than a few people. Maybe your wife gets captured and taken away, bandits burst into your home and mug you.
I'd also enjoy the idea of an actual economy that could be affected, for example if you sell bread and the nearby farm gets burned down, you lose your wheat supply.
But the key point here I'd like to make is to be realistic, getting rich should be really really difficult; and even if you become level 100 with maxed out skills the game should still be difficult; you'll never ever be able to battle a dragon or take on dozens of enemies. And not every skill can be levelled up, if you are a smith you can't suddenly become a good chef or sellsword.
What do you think? Could playing the NPC be fun or too restrictive?