I'm pretty sure you don't. In fact, I'd go so far as to say, framing it terms of another developer will hurt you if you are charging more. If you are deliveri

I'm pretty sure you don't. In fact, I'd go so far as to say, framing it terms of another developer will hurt you if you are charging more. If you are delivering $100,000 in business value, and you charge $20,000 for it it is a win for the company. If another developer charges $10,000 for it. Going with them isn't twice the win for the company. You don't say I'm worth x% more because I work x% faster. You are worth $20,000 (which just so happens to be x% more) because you've done this before, helped other clients realize 5x ROI and you've worked around the nasty #2343 bug in the database that will bite them if they go with someone else.