It might be due to the very mixed colors the decks represent (in the past they have been balanced in some way to represent all colors equally)
This is what a listing for a base set Charizard card looks like on TCGPlayer
These are the most valuable cards in the set: Lisia's Appeal (SIR): 23,000-27,000 yen ($164-$192) Latias ex (SIR): 9,000-11,000 yen ($64-$78) Lisia's Appeal (FA): 5,500-6,000 yen ($39-$43) Alolan Exeggutor ex (SIR): 3,000-3,500 yen ($21-$25) Archaludon ex (SIR): 2,500-3,000 yen ($18-$21) Drayton (SIR): 2,300-3,000 yen ($16-$21) Jet Energy (Gold): 2,400-2,900 yen ($17-$21) Counter Gain (Gold): 1,200-1,800 yen ($9-$13) Alolan Exeggutor ex (Gold): 1,200-1,600 yen ($9-$11) Latias ex (FA): 1,000-1,400 yen ($7-$10) Drayton (FA): 700-900 yen ($5-$6) Black Kyurem ex (FA): 500-900 yen ($4-$6) Excluding Illustration Rares, the least valuable secret rares are Drasna ($2-4), Surfer ($3-4), and Cyclizar ex ($3-4)
When paired with black staples like Bolas Citadel, Rowan can create huge gains in an instant
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This wasnt a minor course correction, it was a total system reboot designed to pull the format back from the brink