Comment by hackeronymous

The problem with billing by the hour is that developer performance varies by a factor of 10x or more, whereas hourly fees vary by about 5x. And most clients would not feel comfortable playing $250-$300/hour unless there was some way for them to justify it. (i.e. more people involved, despite the fact that they may do nothing). Besides, why charge per hour? If I solve your problem, what does it matter how long it took me to do it?