Trade system is +1 reason to quit

Like noone is selling even when you send them message.
When they even accept trade, they change prices on the fly.
even when they accept and do not change the price, they go offline and there goes your trade.

like how hard it is to make basic INGAME marketplace

I list the item, someone buys it, pick from mail.
I view listed items, i buy it with listed currency, pick it from mail.