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While the main series often sticks to, though improving on, the idea of having the player travel around their respective region, gathering Gym Badges, levelling up their Pokemon and generally end up saving the world and becoming champion, that hasnt stopped them from branching out into a whole slew of other subseries
Getting plenty of play will probably have boosted its market value at least a little, but ultimately it's the low supply, inherent to any prize card, that has made Diablosis so expensive
These cards will get a special foil treatment, called Confetti Foil that will be available only in Collector Boosters
TCGplayer is lower still, with unopened English listings starting at $221.99 shipped
When I got back into Pokmon my senior year of high school, kids tripped over themselves to give their old Pokmon cards to me