Even if I go alone & speak to no one, I like the whole experience of a live performance. Being with other people, listening to the introductions, hearing bad banjo jokes, laughing together with others, the whole bit. It's not just the music.

There can be a dynamic that happens between the performer and the audience that far surpasses the listening to recorded music. If the performance is just the music without the meeting of the performer & the audience, I'd agree somewhat.

I don't think I'd knock sociability as a reason. Shared experinces help to build relationships, after all.