Website customers want to be able to shoot over simple requests that can take anywhere from 15 minutes to 4 hours. We ask that clients put a credit card on file, have a written agreement that we will work on request for a small fee per 15 minute unit, and charge their credit card for the time when the job is done. About half the clients seem to dislike this. They say, "But how will we know how much it will cost ahead of time?" Does anyone else get this. How do you satisfy these customers?