Not being able to buy single items from a stack on the marketward.

[Elasia]

Also, I'd like to point out that just like Elasia described, the current system does nothing to stop RMT from making a tons of alt and undercutting others by making a million mules to get the job done. In fact, I'd think the situation would be worse because a player would have to scroll through 8 pages of cheaply farmed material that an RMT can put up on the market board with a script or bot program, while legitimate player would have to do the whole process by hand.

Yeah RMT can be a real thorn to actual miners/botanists, for the most part they usually have always seemed to stick around lower level materials and not a lot of work with finished goods which has always kinda baffled me myself.. sadly i've learned a good bit of mandarin just from the sheer volume of materials i end up consuming.., also considering rmt can power level fast through botting i have no doubt they will end up making tons of mules to get their wares out there.. only thing to really slow them down is the forced main quest with the dungeon crawls to get retainers

Also I've had up to a few thousand items in dealing with mostly cut jewels on the wow ah.. as far as ore with miners posting it up.. i've seen a variety of people posting from singles to half stacks to full stacks.. but the thing with wow is the powerful addon system... you tell it to buy it all out and it will suck out all of it as long as its at or under a certain price per piece regardless of stack size.