I can tell you right now, Pippa made quite a bit more than $20 off the box, if she had opened it with the goal of preserving the cards
You've got:
-The Hits (from the spreadsheet with direct value per card)
-Foils
-Reverse Foils
-Trainer/Support Cards (meta)
-Deckbuilders (meta)
-"Binder Bait" (for things like Wew's Piplup Binder)
-Online Codes (that she gave away FOR FREE)
Every dollar adds up, and with the surge of Pokeboomers and Pokezoomers getting in on the collectathon, she could have sold her stock readily
Unfortunately for her, she put her thumb in the middle of nearly every single card, and didn't sleeve them after opening, rendering them as junk to the more hardcore collectors