I would imagine that a group buy on such an item would be very difficult. The shipping from Coastal to the organizer would be great and would have to be passed along to the purchaser. Then shipping out individual PC's would certianly not be cheap. That's why I don't think anyone has ever tried it, I would imagine the expense would be very great.
Plus, unless people pay in advance, that would be a pretty good chunk of change for someone to layout.