Okay, let’s break this down. Richard Dubin has a strong academic background, but his experience is mostly in teaching and academia. He has worked in show business for 71 years, which is a long time, but the job title 'Factotum' is quite vague. I'd compare his experience to that of a professor or a writer. Considering his skills in editing, research, and public speaking, I'd estimate his hourly rate to be around $75. This is a relatively low rate, considering the demand for academic and creative professionals. However, Dubin's experience in show business and his long tenure in the field might have affected his earning potential. Some professors or writers with similar experience might charge higher rates, but Dubin's unique combination of skills and experience leads me to this estimate.