This is true of everything though, like you said, Chocolate Patterdale's, etc.etc.etc.
The thing is, for every decent bloke who wants to look after a breed, Border or not, there is some twat out there who just see's £££££
I could name and shame several of the BIG dog men who do just the same thing to make a bit of doe on the side, Terriers, Spaniels , Labs, Cockers, HPR's etc, the more exotic the breed the more money you pay for a couple of dogs having their leg over.............................................................pathaetic.
Supply and demand though.