I think the money in GP refers to the other side of the trade -- if you sell an asset on an exchange, you are going to then have money (received from the purchaser) that is yours on that exchange until you are able to extract it.
Ideally, that would be trivial, but that hasn't always been the case for BTC exchanges (Mt.Gox being a notable example for an extended period of time.)
Yes, that's what I was referring to. Instead of "money," perhaps I ought to have said "value." Analogously, if I had a pound of gold, and I gave it to a broker to sell for me, I'd be trusting that broker with my "value."
I think the money in GP refers to the other side of the trade -- if you sell an asset on an exchange, you are going to then have money (received from the purchaser) that is yours on that exchange until you are able to extract it.
Ideally, that would be trivial, but that hasn't always been the case for BTC exchanges (Mt.Gox being a notable example for an extended period of time.)