Well im not convinced. For one, better skills/more experience doesn't necessarily make you faster, it might even make you slower because you put more effort into things others simply ignore, but the quality will be higher. Anyway, i see your point, i just don't think it translates into reality all that well. Not for longterm projects at least, which are hard to estimate anyway.
If you can do the task in a quarter of the time and charge half as much for it then you can double your bottom line.