Maybe it is just coincidence, but what I'm seeing is that used Stern Premiums that the "new bubble" is over with but NIB is still available (pins that have been out for maybe a year) don't sell as easily until they get down close to a NIB Pro. Guessing that operators aren't interested in those as a Pro "will do", so that opens those up more for primarily home use buyers. With the difference in price between Pro and Premium being greater than $1K, it seems the Premiums will take a bigger loss in year 2 through maybe 5.
JJP pins are a little different. The target seems to be home use buyers and a big part being international sales. Operators appear to not be too interested in used JJP pins that cost more than NIB Stern Pros and that seems understandable. The higher price of JJP pins will likely sting a little like the Stern premiums if you go to sell them. As long as the home use buyers will continue to buy the NIB JJP pins and accept that $1-2K loss a couple of years later when/if they sell them, the market will continue as is from this stand point. The initial NIB prices rising every pin will max out people and their return customers might decrease, so ... they need more new buyers. They do seem to be marketing more towards new buyers instead of return customers - I only say that because we see no return buyer incentives ... and I don't expect that we would ever see that. With targeting new buyers, I'm guessing that is why JJP was/is offering some sort of incentives for operators to get their product out there in the public for people to play and lust after. That is a pretty good marketing scheme.
All of this being said, I personally think that they hit the ceiling and will have issues if they have a pin that turns out to be a dud in the opinion of those buyers. They will need to protect themselves from if/when the economy takes a hit again. If they can protect themselves from a 1 year downturn with low sales, they will survive.
That's my theory - correct or not.