Ayoo Sharpies
The reason they sell it for less than it already is cause it will never go back up in the marketplace so there was no reason to keep it. On the other hand stuff like the Anceint Katana and crap above that may keep going up unless re release to the cash shop but that is highly unlikely
Um, no. Saying something will never go up makes no sense. The reason they sell it low is cause they want a quick sale. They need the gold for vending/exchanging. And Katanas won't be re-released; they're MC's.
OP: It's kinda profitable, but you have to constantly bump your thread and keep haggling. Too much trouble in my opinion, but if you have the time go right ahead. But you'll need a few mil to start off with.