Only way I would want this is if the seller got to decide if the buyer could do so. As it does not take much for people to crash the markets as is, and this would cause it to happen even easier.
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i personally dont see how it would change the market at all, cause all its really doin is giving people option to buy x amount out of the stack bein stalled, afterall when settin stuff at retainer to sell u chose single price then amount of items u wanna sell its no difference really ;/
the seller isnt losing any money if they change it , its better then forcing ppl to buy 99 when they only need 1-2 :P
I generally try to sell items in stacks of 50 or less