I don't collect vinyl because I think it sounds better. After years as a DJ, playing in bands, and working around jet engines, my hearing is sh*t.
I buy vinyl because I like having a tactile, physical object. I like having large-scale artwork and liner notes. I like interacting with the music when I have to flip the side. It keeps me connected to the music where so many people view it as a disposable commodity. I have to make a conscious choice of what I want to listen to from start to finish, instead of streaming whatever playlist and never giving it a second thought. It helps me to be more selective. It helps me pay attention.
And yes, there's a degree of nostalgia cash-in, but I don't mind. I will never get tired of buying a "new" New Order album.