If only it was cost efficient to operate those aircraft on scheduled passenger routes.

I'll let you have your fun though. It makes to sense for me to break it down for you but here is a very quick stab:

Obviously if the demand between a city pair is 300 passengers per hour until 1700 and then 200 per hour until 2200 a 402 wouldn't make much sense. Neither would an outbound A380 at 0800 and an inbound 747 at 2100.

Throw in the cost of fuel per mile flown along with intangibles such as aircraft desirability ( AA's and Delta's MD-80s are recent examples of undesired aircraft by the flying public, anything with a prop has already been for a few years now) and you can see how it is no hyperbole, but reality.