^ This. When someone approaches you saying things like "our former sysadmin is confrontational and unhelpful", you don't just have to solve whatever problem the guy who ragequit can't solve. You also have to undo the damage made by the asshole who's contacting you after they tried to solve it themselves, and sometimes by the one or two unqualified people they tried to hire afterwards.

You know how employers are skeptical to hire people who start the interview by saying how awful their last/current workplace was/is? Same here. I've definitely met hundreds of developers or sysadmins that I wouldn't trust, and whose services I wouldn't recommend. I've definitely been wrong and hired some of them myself. But I would never say something like that in public. At the end of the day, who's the smartass that hired these people in the first place? I get it's frustrating but such is life, you still have to be professional about it.

Plus, 200 USD/hour for a quick fix looks like a great deal, but even if the fix itself takes one hour, it's rarely a one-hour job with customers like these. You routinely end up invoicing for less time than you spend deflecting their attempts to negotiate the bill, explaining why it took one hour and itemizing it, and getting them to pay the stupid invoice.