On the other hand, it can also go the other way. Non-technical customers don't actually care how hard something is to build, as long as it solves their problem.

On the other hand, it can also go the other way. Non-technical customers don't actually care how hard something is to build, as long as it solves their problem. So it often surprises engineers how a 1 day script can make lots of money for them. Freelancers often make the same mistake--charging by what it costs to them, plus a little bit more. You should charge how much value it brings to the customer, not how much it costs you to make. Easy to say, hard to do.