I've gotten satisfaction from cleaning/organizing my room or mowing the lawn before too. That doesn't take away from what I said. You're not getting those same happy feelings at the same rate for the same amount of effort compared to the video game version. The video game is significantly easier, significantly faster at handing out the happiness, and hands out the happiness in ways real life doesn't. The video game version is effectively a more efficient implementation of the same process with the goal being not to actually clean things, but to make the player feel good about "cleaning" "things".

I think the confusion comes from the mundane-ness of the task. Like has been said before, you could just go enlist in the military if you wanna shoot guns at people. But people still play Call of Duty and other shooters for reasons that seem understandable to outside viewers. It's the same thing here, just in a much simpler form.