This is a bug that's been around for a very long time from what I have seen.
Pretty sure it's related to sneak somehow. When I was buying Tink bags on my monk, I always DCed when buying from him, but for whatever reason, when I FD after opening the merchant window it allowed me to purchase without disconnecting.
Also, gems have a 10% loss when you buy and resell them. Good for when you don't have a bank nearby, but pretty bad for buying tink bags because it raises the price by over 500plat.
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