The bike shop is busy in June. If you bring your bike in for a tune up, it will cost $39 and take a week.
What if someone says, "I have a bike trip coming up in three days, can you do it by then?"
At most bike shops, the answer is a shrug, followed by, "I'm sorry, we're swamped."
The problem with telling people to go away is that they go away. And the problem with treating all customers the same is that customers aren't the same. They're different and they demand to be treated (and are often willing to pay) differently.
What's your opinion of this? Read Seth Godin's opinion.