Seriously OP either you are plain ignorant or lazy to the trading post, what is so different than that of real world stock market??? Plus this TP is whole wide servers for NA servers, say you have 3,000 gold, you will not be able to control several items for quite long time. You vs hundreds of thousand other player, do your math.
Second fact even if you do manage to conjure up your own “Meryll Linch” company you would still not be able to control price of hundred of items being traded daily.
So I suggest if you can’t make money in TP go back to grinding and stop making stupid rumors about TP, its just making you more Troll tbh.