Funny this has come up right now, as you know I just hooked up my turntable and have been spinning lots of vinyl this week.
I'm not of the crowd that thinks vinyl sounds better and I am willing to bet you won't find many of those types in this group as vinyl never was a very good medium for this type of music. Most of the vinyl junkies I would think are in the classical/jazz fields.
As for buying vinyl, I hardly ever do anymore. I can't think of a single LP that I have bought in the last five years, new or used. Most of my vinyl is as you stated older stuff not released on CD. And given a choice I almost always would take a CD over vinyl.
As for have I thought about releasing my own music on vinyl, yes I have. I almost did that back in the mid 1980s for my first album "Point of Arrival" but I didn't quite have the money at the time so I released it on cassette instead. In retrospect I probably should have released it on LP and just borrowed the money to do it. I've also thought about releasing something new on vinyl, not because I think its a great medium for music but as a possible way to avoid downloads. It takes a lot more effort to rip an LP then a CD so you really have to go out of your way to do it. I think in the end I would probably do a DVD-A release instead if avoiding bittorrent sites were my main goal.