I think you've touched on another factor that hasn't helped the serious "vinyl head" in recent years, and may be a factor leading to fewer people wanting to part with their hard earned for "unknowns" - the proliferation of expensive "dodgy" 45's. Johnny Watson, 7 Wonders of the World, Vandals, Jeannie & Valaquons, David Rhodes, and a few records I've seen on E-bay recently that have enough gloss on the vinyl for the average male to safely use as a substiture for a shaving mirror without fear of "bladeslip".
I remember one collector showing me one of the aforementioned, which he'd just "shelled out" a relatively serious wedge for, and looking totally deflated when being told it wasn't "real". I think he pretty much gave up the ghost after that.