In Germany there is an airline (around 40 B737īs and F100īs) that is wetleasing to all major charter airlines. It offered the copilot-seat to dentists, laywers etc. They had to pay (!!) around 35 Euros per hour. Of course they had a valid ATPL (dentists earn good money in germany :-))
This way this airline could operate much cheaper than anybody else and made big cash :-))