How does fei method work to xfer?

[netherangel]

i recently came across a friends account im thinking about buying from him. hes got over 5bil gold on it. my problem is i didnt quite understand how the fei method works....as this is the way in my uunderstanding how most people are xfering gold these days, with spirit shields and such. what i was wondering tho, is if these shields are dropping in price which is how you buy them on the buying account, and then turn and sell them to your selling account. how does the selling account not get stuck with a
54m shield that wont sell on the ge? to me this sounds like the selling account would get stuck with a lot of crashing items????? thanks for any help ,

please private message me as i most likely wont check this before i go to bed, thanks again