Of course this is different if you can sell several cards in the same order, but even selling a $2 playset isn't that appealing with $0.50 off the top
You can see an overview here: 90% (4th card), 60% (5th card) 5% (4th card), 20% (5th card) 1.666% (4th card), 6.664% (5th card) 2.572% (4th card), 10.288% (5th card) 0.5% (4th card), 2% (5th card) 0.222% (4th card), 0.888% (5th card) 0.04% (4th card), 0.16% (5th card) So, if you open 1,000 boosters, there should be one to two cards of the crown rarity
For 256 cards, plan on 15 double-sided 9-pocket pages
PS Platinum Secret Rare QCSE Quarter Century Secret Rare Blackwing - Vayu the Emblem of Honor X DARK Level 1 [ Winged BeastTunerEffect ] ATK 800 DEF 0 This face-up card on the field cannot be used as a Synchro Material