If it happens, It doesn't bother me at all, I'm happy in what I do & that's what matters.
Many of my customers are seriousley wealthy, I find these have a good attitude & it wouldn't bother them how much you earned. However, I do feel there are many customers who might change their attitude if they did know just how much I earned, in many cases, more than them for less hours.
I make an effort to be & look professional, it's very important to me. I've been on many commercial job where there have been muliple trades on-site & I have looked the smartest & most professional by far!!
I prefer my customers, both domestic & commercial to know as little as possible about the economics of my work.