So, what is "Market Price"
While the front side is good enough to see play on its own, the fact that it only has four defense counters makes it relatively easy to flip (a single Sheoldred, the Apocalypse attack gets the job done), and the backside offers a very powerful creature that can defeat a battle or kill a planeswalker each turn while potentially generating card advantage as well
You rarely need two colours fixing at once
On top of that, this product is sold via lottery only at the Pokemon Center Online Japan store
Also, although its been updated many times (and hence had its date shifted forward each time), the curses article was the very first thing I wrote for Draftsim back in the day
While some may argue that Pokemon cards are more valuable because Pokemon itself is a monopoly, or that the game is played by more people (it could be argued that more people play Magic the Gathering more seriously), economics tells us that price is determined by supply and demand factors