Rot Hulk: Secret Lair | tcgmode

Anyone have any idea why this version of \[\[Rot Hulk\]\] is so high? And also why people are buying it at €150+? The only reason I can think of is scarcity, but it's base version is worth <€1 and is currently more expensive then \[\[Wilhelt, the Rotcleaver\]\] which I assume is equally as sc...