A simple idea that there could be a second shop that sells/buys things such as ingots buy the stack, instead on one at a time.
Many people use the shop to sell large portions of their excess gold and iron as well as other valuables, and the current shop signs can cause players quite a bit of spam
with their one-at-a-time sales.
to paraphrase DaVoBMX, " '$12 has been added to your account.' is being imprinted on my eyes'
This would just be a second shop in addition to the current one, it would have the same items for sale, and would have the same ratios.
It would just be on a larger scale.
This 'Elite' shop would be a great way to save players time and reduce the spam that can be caused.
-Thanks to Fathertimekeeper and DaVoBMX1725 for the idea!