Reply 17#17 alistair's post
You have to have a remaining balance of 20G after you have exchanged or transfered any treasure.
At the moment, you have 8G so would not be able to exchange or transfer any of them. If you had 38G you would then be able to transfer 18G and while the promotion is on that would get you 8.1 points so 8 rounded down.
Hope this makes things a little clearer.