Warning: Realism ahead!
When has anyone ever NOT been shrewd and calculating in a profitable business? What JJP is doing is classic Business 101. Handle all product defect issues individually and in private. Do the least amount as possible to satisfy the most vocal customers, and NEVER make an open statement to potential customers that there are any problems, because there are no problems that prevent the machines from performing their intended purpose. Stand on your warranty that says we will repair or replace only when the product can no longer function as intended. This is sound legal advise that they are getting from their counsel, I can guarantee it.
And that is the big rub for everyone who wants a "perfect" playfield. JJP can stand back and lawyer up and do absolutely nothing, and they would be within their rights.
The following is the phrase that just about every lawyer will agree with:
None of the defects that customers are experiencing makes the machine unusable as a coin operated amusement device.
Maybe we need to say that again for emphasis-
None of the defects that customers are experiencing makes the machine unusable as a coin operated amusement device.
I am not a JJP fanboy, don't own any, haven't seen one I can't live without, but I am also a realist, and anyone living in the fantasy world that JJP will suddenly jump up on a soap box, scream "Our playfields suck and we are working on it" is fooling themselves.
If I did own a GnRCE, I would be selling it to another collector if they are willing to buy it at going market rates, or selling it back to JJP if nobody else wants it at MSRP plus shipping. That is just simple Economics 101. It sucks, I would be pissed, but as someone who understands the reality of being in business, I also know what to expect from one, and isn't it surprising, be it Stern, JJP, or you name the manufacturer, they all follow this same playbook when playfield defects crop up? Hell even Bally/Williams back in the day did the same thing when people complained and the results were the same back then, too.
Moral to the story: be loud, be obnoxious, be vocal, get in their face and the face of potential customers. Put up a billboard near the factory, take out an ad in trade magazines, post to social media, start a "Screwed by JJP" fan club. "Only the squeaky wheel gets the grease" is a saying that applies here. A Class action lawsuit is a dead end (see lawyer loving legal statement above) so the court of public opinion is all you have left.