It's just quicker. You work out the details and send the trade and you get the money when I pick it up. Unless you'd prefer the normal trade, then I'll send my half right now.
Not really sure how to descibe it. You send Ashy's stuff and what you expect money-wise in return and send the trade (it will be auto accepted I think) and the money will be automatically sent when I accept it. Or normal trade. As you prefer.