are fairy type cards rare Pokemon -10 Card Lot - Only - No Duplicates Fairy Type Pokémon Cards —

And as has been suggested by the aforementioned list of most valuable Pokmon TCG cards, this pattern generally repeats, meaning Secret Rares are consistently more valuable than other cards in this way

It seems like this would, by definition, make 'scalperiness' a gradient rather than a binary that can be clearly sorted, but some resellers themselves seem to believe there's a definitive line

Then all the chosen cards are discarded at the same time.

Halftoning capitalizes on an optical illusion

TL;DR: If someone tries to draw extra cards, they either end up discarding and drawing, or milling instead, so they never actually go up on cards