....I think it's a fairly widespread view to value joy for its own sake. In fact, I would say that's pretty much how normal people would say they view joy.

So normal people don't make sense, what else is new.

The problem here is that joy-in-itself isn't anything. Say you're a huge hedonist, and you try to maximize your pleasure. Maybe you start with some notion involving a speedboat and cocaine. Then you might ask, how can you maximize your pleasure even more? That means you have to ask why you like things. You like things for reasons, and reasons have meaning, and meaning is knowledge. So maybe your next step is to add music or something. But in doing this your activity isn't just having pleasure, it's finding things out. The more you work at maximizing pleasure, the more you're finding things out, and the less of a cliche the things you enjoy are, and pleasure-in-itself becomes less real, because it never really meant anything. The alternate path is to stick closely to the cliches, ride around coked-up on your speedboat forever, and fail to really have a good time because mechanical behavior isn't genuinely enjoyable and trying to maximise pleasure is self-defeating.