I have a theory that people brag about vinyl because it gives an impression of being 'old school', and that they've been into music for far longer than us novices, and that their opinion is therefore superior to ours...
Also, I think it has something to do with the fact that the scenesters of 40 odd years ago, would, by default, have huge record collections, and so the scenesters that followed looked up to them, and aren't confident enough to say 'ooh, I like CDs better, actually', as they're afraid of change.
By nature, scenesters aren't capable of having an independent thought, so it's understandable that they're reluctant to take on a 'new' idea, like CDs, without first getting the approval from their little scenester buddies. Who will be to scared to say anything. Seriously, if Darwin was studying scenesters, he'd have been amazed they weren't extinct yet.
That said, I have a slowly growing collection of records, but that's more because I can pick up albums 2nd hand for about £3 and singles for 99p, but as I listen to most of my stuff on computer, it's not ideal...