Madkill, say you are a player who has 5 accounts, all accounts geared best for finding items. You find some awesome items on all five, and want to consolidate them all to your best player. So you add them on the market for $5 and the main account buys them, effectively making one "super-player" account. This is not fair to all the players that have worked hard for the items they have acquired. This is how people will take advantage of it and abuse it.
Gem, lets say you didn't read the part where each price is at a 'minimum' which is the general stores purchase price, that makes this point quite redundant doesn't it?
(Not too mention that such items have a minimum level as well)
Also: This game has a larger Online Social value than most other games, since you can join a town and be apart of it, so what if there's a cheater, they wont dare show themselves because in the end, if they did it would be very easy to notice that all of the 'players' in this town are 'exact' so it would simply take one admin to find and ban all accounts, possibly via ip, this cheater has then wasted time and because we just had to wait without a care, we still get to enjoy the player market.
Not to mention the fact that no one wants to be friends with 5 of the same person.