Composerbell
Member
I think there's a couple ways of approaching this Gerhard. You're assuming this is based on an hourly rate, and they're taking a long time - or that doing it faster means you should charge less. The value isn't in how long it takes to do the job (faster is a benefit to you, not to them, if all they care about is delivery by the deadline).If you're paying over $100 for this then either they're over charging you or they're very inefficient with their time.
Flipping burgers is an hourly job, because you're paying for someone's time - to be availible to flip the burgers all day. Doing a mockup is not a time based job, they're not paying for your hours - they're paying for your product.
Trying to calculate value based on how long it takes you presumes that you have a certain cost of living, and you're only charging what you need to maintain that. But that has issues too, because different people have different costs of living, for doing the same job. Or if you're a trust fund baby, you could just do stuff dirt cheap because you don't actually need the money at all!
If you can do the job fast, that's great - you charge more for speed because you're providing greater value with quicker turnaround. That's why a rush job is more expensive, not less!