Complaining About Your Shop's Diagnostics Charges?

On your way to work Wednesday morning, your car starts to stutter, spit and sputter, then dies at the traffic light. Next light, same coughing, car stalls, you begin to rage. You've noticed a band of wild monkeys trailing you, so on a hunch, you get out of the car to check things out, but it turns out not to be the banana-in-the-tailpipe trick. Would've been a cheap fix.
Time to take your car to the shop. So you leave your steed in the trusted hands of your local independent repair shop (since you gave up on the dealer years ago). Your mechanic calls the next day to inform you that all the drama was caused by a broken connection in the wiring to your #2 oxygen sensor. He says you're lucky, it'll be a 5-minute fix. But when you pick your car up the bill is $240. "What the @*#!?" you're thinking. "Why am I paying $240 for a 5-minute repair?!!!"
Settle down. Hold your horses, take a powder, count to 10 -- whatever works. You're forgetting that you walked into the repair shop with a giant question mark over your head. Your mechanic, who has years of experience and participates in expensive continuing education classes to stay up on technology, figured it out for you. And it didn't take 5 minutes to diagnose, either! He spent more than 2 hours on the diagnosis alone. That's 2 hours he didn't spend replacing Mrs. Grimley's alternator. So is his time worthless? Come on. Stop complaining. Your car's fixed, and $240 is cheap these days.
What about those monkeys? Those hungry little critters chasing you down the street were a different breed of primate -- service writers from your local dealership. Good thing you got those monkeys off your back.