that's their decision for the future of they want to risk alienating their buyers. Had nothing to do so with the commitment that was already made to them
Personally I only signed up once for PFS 4 years ago and never did it again after learning my lesson. I've since been monitoring the release schedule and flipping a few coins here and there (no intention to make it a business, but free money).
I haven't read the full thread, but I'm not sure it's that simple of an answer. There are many things to take into consideration: whether it's a binding agreement based on the fact that the coin isn't in anyone's possession yet, if it's a problem since the seller wasn't aware of the price, if the coin falling in value is an issue since one can return it, and many many more.
This is in no way a simple question to ask your LOR. If there are a few people who really want an answer, I'd be happy to present the question to local dayanim, or in Israel if needed. If so, just send me a message with all the details and your reasoning.