Putting value on a thing is an idea. If you couldn't dispose of physical things your house, it would be piled high with trash. You get things because you have an idea of how you want to use that thing ( I guess the ego could play into this as well.) Once you realize the idea for getting the thing was flawed, you can either iterate on that idea and try to find a way to continue using that thing, or admit that the idea was flawed and just remove both the idea and the thing.