"What do people actually do when they offer a professional resume rewrite and linkedin overhaul and what have you? I have never seen a before/after, so what makes them worth 60, or 80 or 100 dollarydoos?"
I've never used one or looked into any of the services. My guess would be 1. Pretty up your resume with a design template 2. Replace your verbiage with action/trendy words 3. Correct typos and bad sentence structure
If you find a company that gets good reviews, and your resume needs a lot of help, I don't think it would be a bad investment.
Why is it worth that much? Maybe it isn't, but when you look at how much people spend on a degree, $80 isn't much to help summarize your experience.