I pulled a cheap stunt like this when I used to live in El Paso..
An airline put a full back-page ad in the El Paso Times..
“Round trip to Los Angeles only 79.95”
I read all the fine print, it said it was on a space-available basis. You would show up at the airport and sign up for your flight, you might get on and you might not. But if you were bumped you got a goodly chunk of airline miles.
Well, I got to LA and turned it into a game, I would check out how booked up a flight was and then turn up and be bumped for a full fare passenger...and collect my miles.
This went on for quite some time and I ended up with an unbelievable amount of miles...it turned out the Vegas airport was ideal for this opportunity... I was spending more time in Vegas than Wayne Newton!
I flew all over the place New York then back to CA..then back home for a rest and NY again... my friends in NY were sick of the sight of me..lol.
At almost every layover I managed to pull down more miles by being bumped off of a few flights.
It turned into a quest...I traveled a million miles and ate a million packs of free peanuts...
Genius!! LOL