The psychology of retail pricing is fascinating. I remember years ago working in my student job when a new DIY widget of some sort came in. The sort of thing where it's inherently cheap because it's a low cost item, not because they're low quality. Anyhow, normal retail across the board on this sort of item was about a pound. The boss I remember remarking when a new batch came in as a new line of this particular widget that he couldn't see how they could do it so cheap. In the end he had to decide to keep the retail price stable because even though he felt it was a crazy mark-up from cost, if he'd suddenly started charging less than a pound, nobody would have bought it - "seems to cheap to be any good." At a much higher price, there was a time not so many decades ago when Gibson couldn't sell Les Pauls beyond a hardcore market for love nor money. A new management team came in, doubled the price. Result? They couldn't make 'em fast enough. Same thing has happened in many markets (including one of the software firms my brother worked for over the years). Perceived market value is definitely a thing. If another company is charging that much more, maybe they didn't want to look like the cheap option. Perceived exclusivity - if they charge that, it must be worth that.
On the other hand.... I know a costumier who was making high-end, perfect copies of stage costumes back before anyone had even heard of "cosplay". She specialised particularly in making corsets. Thing she hated, though, was doing the full sequinning of a corset, so she had one price for plain, then a whacked up price for the full hand sequinning. That way, most orders, people would DIY it, rather than ask her to do a time consuming job she hated, but on the other hand on the rare occasion when someone came to her that was prepared to pay what she charged, it was an earner which sweetened the deal. It wouldn't surprise me entirely if they're simply not that worried about selling this jacket for whatever reason, but they're not going to refuse of someone comes along who is prepared to pay the big money.
Of course, I also remember when the BK range shot up hugely in retail price, but they were doing regular 'half price' or 'buy one get one half price' deals, so it could be preparing for a bit of market psychology that way as well.
Regsarding BK, considering they are selling in Japan through Mushmans, I wouldn't be surprised if they are hoping to start charging as much as RMC soon