That's not exactly the question David is asking in this post about last-minute planning, but it could be. The question he's really asking, after running through some last-minute planning requests he's been able to pull out of his hat, is, "If people had to pay extra for last minute planning, would they still wait until the last minute?"
Yup, I'd bet they would. Those who are organized would never be in that situation; those who aren't organized, well, I'm not sure they could make themselves get their act together ahead of time no matter how hard they tried or how much it ended up costing them. Fortunately, professional planners tend to be a pretty well-organized bunch. I bet they were making sure everyone had enough of all the different colors of crayons in their boxes back in pre-school...