So much of this is pure BS. Almost all the sellers of this game are brand new with no feedback.
The bids are probably hijacked accounts leading people to believe there is a strong demand.
I see Monster Bash and other games regularly on EBay for $2500 if I contact the seller at a private email off Ebay. They might have one or two tools pay 15k plus, but these aren’t smaller ticket items people are willing to pay 3, 5, or 10x the value.