Who decides what is useless? If I compare the enjoyment that I receive from having an iPod and being able to listen to any song I own at pretty much any time I

Who decides what is useless? If I compare the enjoyment that I receive from having an iPod and being able to listen to any song I own at pretty much any time I feel like it against the amount of labor that I performed in order to acquire it, I feel like I came away with a pretty good deal. I expect that there is an item or an experience that you value which could only be purchased with labor via money that I would consider useless. That is the whole point of having markets, so that people can make their own decisions about what is and isn't useful to them.