There's an Irish pub I used to frequent when I was an undergrad. One day I glanced at the drink list above the bar and was surprised to find that an
Irish Car Bomb cost $10. That's expensive! Curious, I asked the bartender why one drink cost so much more than everything else they offered (most drinks were $5-$6). I expected him to tell they were bigger than usual, they used a special blend of whiskey, something that justified the high price. He told me the real reason: "We don't like to make them." Wow. I didn't see that one coming.
Years later it makes perfect sense to me. Sometimes a client asks for a service you'd rather not provide. Rather than turning business away (especially if you want repeat business) charge a premium. If they decide you're price is too high, great: you didn't want to do it anyway. And if they accept your price you make extra money. Good news either way!