5% in one day is quite a drop.
I think you'd have to be crazy to be either the buyer or the seller of this, unless you were doing it for the publicity. I also wonder if they'd agree on the bitcoin price in advance, or if they would pin it to the dollar value up to transfer.
Either way, imagine being the buyer, taking up a loan, maybe buying the bitcoins, and then suddenly not having enough money because the price has gone up/down.