That doesn't take into account the speed of delivery. There may be some customer out there that doesn't know when they need something delivered, but once they k

That doesn't take into account the speed of delivery. There may be some customer out there that doesn't know when they need something delivered, but once they know, they'd be willing to pay an extravagant amount of money to have whatever it is there in 30 minutes. The most immediate thing I can think of is a bomb, which is pretty much exactly that need :) But there may be other use cases with similar required delivery times.