Perhaps when most of the key cards reach $10k or so you might hit a bit of a stall point, so theres still a lot of room for growth
Current MEGA era boxes (8,500-14,500) are early in their appreciation curve, with 6 of 8 sets not yet out of print
SR Super Rare UR Ultra Rare SE Secret Rare UL Ultimate Rare PS Platinum Secret Rare CR COLLECTOR'S RARE QCSE Quarter Century Secret Rare Limited Limited Dimension Shifter X DARK Level 6 [ SpellcasterEffect ] ATK 1200 DEF 2200 If you have no cards in your GY (Quick Effect): You can send this card from your hand to the GY
Destroy these cards during the End Phase in which they were Summoned this way and banish them
I guess youre going to run some creaturefall/landfall/artifactfall type effects to take advantage of this
Breaking / Entering The Breaking half of Breaking / Entering is just a toned down Glimpse the Unthinkable, which is a nice card to have in mill decks (or if you want to mill yourself, eight cards for 2 mana is a good rate)