Like everything, they're worth what folk will pay - when there's lots of something, like TAF, and they all sell for X+, we can all agree that X is the base price. But with something a bit rarer, like GNR, a few richer individuals may snap them up and be willing to pay more than what others think is 'the going rate'. Is that wrong? Or unfair? Probably, but this is capitalism rather than communism we live in, so it's a fact of life.
We will see. Mine is currently up for sale and the person who came to view today has said he may not be offering the amount I'm asking. I think it's an above average example but others may have their own opinions depending on what they've seen available before and how long ago, and how much they want it and how much they can afford etc. So after he has had a few days to mull it over, and if he decides not to pull the trigger, I'll do a Dutch auction with it, with full disclosure and pics and video, starting high and going down £50 a day until it sells. Will it sell for £4000, £3800, £3600, £3400, £3200, £3000? Also bearing in mind the current glut on games on the market right now, plus the fact it's summer and we play our games less and are outdoors more and may have holidays and child entertainment to pay for ......
Meh. I'm rambling. Of all the games in the world, this is definitely one of them.