Vault 13: Dwellers Journey Vault 13 is an interesting Vault, as it doesnt seem particularly sinister compared to the others on the list
Putting a name sticker on this creature later won't cause the reflexive triggered ability to trigger
You can give all your artifact creatures and vehicles a +1/+1 counter each turn, and then turn those counters into card draw after combat
Sometimes youll even find cards that are entirely exclusive to these boosters, and that exclusivity can drive their stock up
But it's also true that selling random booster packs will likely encourage spending over a longer period of time, as players hunt specific cards
Depending on the board state, the player could opt to search a Train, such as "Heavy Freight Train Derricrane", to try push for game by Xyz Summoning "Superdreadnought Rail Cannon Gustav Max" and "Superdreadnought Rail Cannon Juggernaut Liebe", or search "Machina Citadel" to prolong the Duel