Those KLM flgh academy guys had the full 73 rating on their license, they only needed to pay for the base training. They made a good deal, knowing that in a few years time KLM will hire them.
But if you dont have a 737 rating, and pay 20.000 thats another story, but at the end of the day its still better then eagle jet or whatever, you get payed to fly, and you pay for the rating. Not such a bad deal imo