I feel that the Auction House has ruined several rp niches already, and should be removed from rp influence.
(Vanilla blocks and materials pose no problem, in my opinion.)
Availability: AH is accessible worldwide, making merchant town schemes ineffective when compared to extremely locked down and fortified PVP cities. This lack of archetypes removes the lively feeling of nations, as well as removes the benefit of allying with other nations for reasons other than PVP numbers.
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RP Flavor: There are several neat things that can lend flavor to a merchant that simply cant be conducted via Auction House. Descriptions on items are nice and all, but there is no story behind the item through such an interaction-free medium. There is no difference between a natural boutique sourcing finely woven clothing from local wool and someone with free edit tokens and an underground 2x8 sheep farm.
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Non-Standard Currency: This is one of the more glaring issues, being the lack of bartering. Through AH, you can only exchange an item for mina rather than for another item, information, or other means. Due to its superior availability and concept of hassle-free sourcing, people tend to pander more towards AH than the few surviving merchants.
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Uncharacteristic Outcomes: With the lack of moral monitoring in the AH, you can often see things like 6 year old children walking around with weapons of mass destruction with no rp backing whatsoever, just because they found a good deal on AH for their free 100 mina when they start a character. Additionally, Mina is often exchanged OOCly, which only worsens this. People can mule mina from their wealthy noble, through a friend, and back into their fresh character.
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I'm sure there are reasons this outcome was chosen to begin with, and I'd like to see those if anyone has them,
I just cant envision many reasons it would be beneficial in remaining.