When I did freelancing, I charged a bit more than I felt I should... but went above and beyond. My hourly rate may have been high, but I spent many "non-billable hours" making sure everything worked great and any changes (their fault or mine) were accounted for. I did a few jobs where someone else controlled the billing, and kept us on a tight schedule. Every hour was billed. We were "fired" (AKA contract not renewed…
Brilliant, thank you for your comment!