Starting in the middle, I'm primarily a classical and opera collector, but I do have a nice collection of traditional jazz (much of it courtesy of a college friend's dad, who passed me his family 78 collection). I've noticed the effect of demographics over the years. Back when I started, as a beginning high school student in the middle 1970s (and oh, my, was there ever a better girl magnet than collecting 50-year-old 78s as a young teen?), records from the teens and '20s were everywhere and went for maybe a quarter each. The "easy" material gradually crept newer over time--what I realized after quite a lot of years was that the records readily available in flea markets and such were coming from all the basements and attics and garages of a succession of generational cohorts--first the folks who bought fox trots in the '20s, then the big band music from the '40s, and so on. By now, I think, we've largely passed through all the 78-buying cohorts, and the records don't turn up very often except on eBay or in dealer catalogues, so I wouldn't be at all surprised if those blues records have become exceeding dear. The most expensive format with which I have direct experience, by far, is operatic cylinders; those really are a rich (or soon not to be rich) man's game. And, yes, I've bought some of those. Er. Um. That cylinder machine that you saw at LC, by the way, was probably an Archeophone. Those run around $20,000 apiece. "Visceral." I like that--it's a perfect description of the kind of sound I was trying to describe. It may not be as "high fidelity" as what comes off LPs, but it has real power and impact. Now, pardon me while I practice my back stroke!