Ebay publish end prices, most auction houses also show achieved prices against catalogue numbers on their web sites after the event (or will provide you with lists) Have a look at Christie's or Sotheby's. They do this so that people can see that they achieve good prices and so place their items with them. It is good publicity.
I thought the attraction of JM's auctions to sellers was the high prices he achieves, and also the relative transparency of his auctions when compared to others . So if nobody knows the end prices nobody will know what price the records are making, after a while it will become hearsay that he achieves good prices.
Quite often a record price is altered significantly after one of his auctions (Satisfactions?) but if this info isn't in the public domain it won't have that effect.
So a good thing for a buyer like me John Manship - keeping record prices lower ! Keep those prices private!
Anyway, I won't be subscribing, particularly not just find out what some people are paying for other people's records. Maybe we could club together for a soul-source subscription and then just publish stuff on here anyway?
Cheers
Paul