As far as I know, 300DDR has been doing this for quite a while.
http://300dollardatarecovery.com/data-r ... alculator/
For me, I've just simplified my pricing, leaving no reason for calculations.
$350, minor data recovery
$700 + parts, major data recovery (head changes, platter swaps when we feel the odds are good, chip off recoveries and sometimes very complex firmware and media damage issues that will take a very long time to recover, with low odds of success)
And, as was already stated, I think most users are skeptical of these tools as they rarely give an immediate number and require personal information that we know will result in phone calls and emails that we are trying to avoid by using the calculator.