I don't see it as productive to respond on the internet to the posturing and credentialing about who has seen more utility functions or taken more econ classes, as you wrote above.
I can assure you that Robert Pirsig garners utility at different costs and quantities in the scenario he described. That is all that a utility function is: a function of utility at varying quantities. This is an elementary topic and there's nothing more to be argued here. I'm sorry that explaining it again rubbed you the wrong way and encouraged you to write a condescending response towards me.