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There's some serious players in this game, just look at this:

I had one of these once upon a time and a couple of unlimited ones in pristine condition. I remember a bloke catching a train from Stoke to Blackburn just to collect one from me for £140. I try not to think about it too much.

Yes, but it's an artificial scarcity. I guess it's a free market. Just seems odd to me

In the case of the above card the scarcity is actually real. Only 3200 were ever printed in they year 1993 and this card is on the 'reserved list', meaning Wizards of the Coast have vowed never to reprint it. How many are left in the world after 25 years of floods, wars, babies eating them, wear and tear loss etc..?

https://mtg.gamepedia.com/Reserved_List

There's a lot of debate about this list, some love it, some hate it, but it does do one thing for sure, it makes these cards desirable.