you don't mention your country, so it's a broad question like saying i want to buy a new car any discounts? Different discounts in different countries, different airlines have different promotions at different times of the year
Why would it be wrong? Lounge is perfectly fine and there are probably great methods or gems on bhw too
sure, a site specifically for the topic would be easier but sometimes you can find a great source from someone here 
So your solution is to apply to an airline, go through all the training just to save a little on an airline ticket, have you really thought this through lol!
Who told you you need to apply? You can do it illegaly
Maybe the airline would notice you're not employed by them, a flaw in the master plan maybe
Someone else already did it: https://en.m.wikipedia.org/wiki/Catch_Me_If_You_Can
Lol! You're not really master criminal material
