[BUG] Marquess Crown Sellable

[Floofies]

Describe the bug

Reported by @t_34_747 on Discord.

Sold a Marquess crown to the Nerve Master merchant, but was still able to summon it back afterwards and even sell it again, potentially producing infinite money.

Round ID:

Spider256-07.35.59

Steps to Reproduce:

1. Acquire a Marquess crown.
2. Go to a Nerve Master merchant and sell the crown to it.
3. Summon the crown. (And potentially sell it again)

Additional context

The crown in question was a "Crown of Sunmark".

[YakumoChen]

The stockpile machine doesn't actually generate money, it just adds credit to your MEISTER account, which... someone with the crown can probably do already through the Nerve.

A bigger issue is if this works from the merchant balloon, and is still summonable.