I disagree. I expect a professional to show up with the tools of their trade, and be ready to work.
But more than that, they way I view someone like that is someone who would rather nickel and dime me to death than to just just honestly charge the rate they need to charge. I would feel there were going to be numerous little surprise charges on their invoices. And being a hired gun myself, who started out as a nickel-and-dimer, I would view the individual or agency as lacking in experience.