In the USA Oprah pays her flight attendants 110,000USD per year. Wing Aviation in Houston pays theirs 85,000USD per year. A private flight attendant friend on a Global Express in the USA makes 95,000USD per year another on a GV in San Francisco makes 100,000USD per year.
This is indeed the going rate in the USA for either FAA part 91 or 135. Due to the economy there are some corporate flight attendants that will work for 65,000USD per year but those are mostly ones with limited experience.