I really think they are trying to keep the faithfully brainwashed away from anyone who doesn't seem totally "in". This is what I've seen in the last year or two.
But as a "born-in"(almost) I've also observed a bigger pattern over the years. Policy on the matter of underperforming publishers has flip-flopped back and forth, sometimes policy is to invite the "weak" (ugh) ones to everything to encourage them, then next you hear "weak" ones are off the radar. Off with their heads! We don't want them!
If anyone back in NY has any sense whatsoever, they realize that given it is 45 years past 1975, inevitably most inactive publishers are actually people who've figured out that it's just a scam. They just don't make a clean break because of family. They obviously haven't figured out what to do about it.