I'm sure some of you (as have I) made the mistake of putting an item/lion up for trade for both GB and SB but forgot to switch over the buyout price to 'Both' instead of 'Either' before creating the trade.
Now, someone bought your stuff for a ridiculously cheap price and you're sitting there facepalming yourself. Oops.

I can't tell you how many times I've made this mistake.
So I think it would be really helpful if a pop-up would appear before your trade is created.

For example, when you transfer items/lions over to a member, a pop-up asks you if you are SURE you want to do so.

So to avoid making a fool of yourself and selling off your expensive items and sexy lions for dirt cheap by mistake, a pop-up will appear.

Something like:

'Are you ABSOLUTELY sure you want to create 'TRADE NAME HERE' with a buyout price of #GB AND #SB?'
[Yes] [Cancel]

or

'Are you ABSOLUTELY sure you want to create 'TRADE NAME HERE' with a buyout price of #GB OR #SB?'
[Yes] [Cancel]