“A door is what a dog is perpetually on the wrong side of.”

“You can’t just ask customers what they want and then try to give that to them. By the time you get it built, they’ll want something new.”
- Steve Jobs

There are a few other good business quotes here that are worth reading.

But the point is innovation. You have to think about something that your customers will love before they are asking for it. Otherwise, they might ask someone else.