While it certainly seems shady, I don't understand why you guys weren't upfront as well. Why didn't you set up a business account with P1?
All that being said I'd be curious to know how your final costs tally up, especially with transport and brokerage fees.
BTW I have never had any such...
Never. Keep in mind that Stern and JJP have previously done unannounced raising of prices which the distributor has no choice but to do the same, regardless of the quote given. Elvira and GnR come to mind.
Retrace your steps. Whatever is wrong now is most likely your doing. Game worked 'somewhat', you did repairs, now game no longer works. You likely either made a mistake during the repairs or in reconnecting the boards or damaged something else.
While I don't have an opinion on your asking price I'm pretty sure those JP will not sell @$9k. They are still in production and with the current exchange rate plus 15% tax they come in at 8900$CAD NIB.