The main reason people are paying these crazy prices for original Blue Note LP's have more to do owning a piece of music history rather than the belief that the sound quality is above current audiophile re-issues. Though some may say the originals do sound better.
The sound quality of RVG's (Rudy Van Gelder) work on these original Blue Note titles have been criticized by some folk as being far less superior by today's standards... and yes that may be true. Some of that obviously has to do with the technical limitations of the electronics in those days. But another reason for the sound on those Blue Notes... RVG was giving Alfred Lion the "flavor" he envisioned, which is the "Blue Note Flavor". Some get it, some don't. Some like it, and some don't.
How much would some people pay for a piece of Beethoven ??? Same applies here. Just as Beethoven is treasured a few hundred years later the same goes for Blue Note, and many artists that have recorded for Blue Note (and other record labels). Jazz itself is Americana history. It's a shame that so many Jazz artists that put out these great works of art never got the recognition they deserved for their contribution to America then and now simply due to the color of their skin.
Did you ever notice that there are so many old classical records out there in pristine condition, as if they were never even played... That's because people bought them for show. Behind closed doors people were listening to Jazz.
As I wrote in a recent piece, the Blue Notes were according to Steve Hoffman, who's been involved in the remastering for Chad and Joe/Ron, "overloaded," giving them their characteristic sound To my ears, the Impulses are far better sounding--though one can't necessarily judge by the LP release, only by the tape. Different artists, different tastes, different jazz styles, etc.