Thanks ! I think you gave a great answer !
Where did you get those numbers if you don't mind me asking ?
That's how I started billing clients initially; basically making stuff up, estimating project complexity v. time-to-implement, and so on.
Eventually they were reasonably accurate, then I stopped doing it for awhile. I've toyed with the idea of getting back into it again, but I'm a terrible hustler, and don't have the patience for it :(
I've always been curious about how freelancers make such a high hourly, because freelance websites are full of people charging $15/hr.