If you're interested in how often people get away with this kind of scam, and how they get away with it, I strongly recommend the two episodes on the subject from the popular podcast "Behind The Bastards" titled "Part One: The Fake Doctors Who Gave Everyone Alzheimer's" and "Behind the Bastards (2018)
Part Two: The Real Bastard Was Health Insurance Companies All Along"
These episodes detail several people who pulled off these same scams, including how others tried to turn them in for it and were ignored.
Not to be pedantic, but you suggested general statistics up front (how often people get away with it) then delivered anecdotes later: examples from several people.
These episodes detail several people who pulled off these same scams, including how others tried to turn them in for it and were ignored.