Modular Halil
Spot on. For most, LCCs are a stepping stone to better jobs. Hence, they're ready to do whatever it takes for a couple of years to get those A320 or B737 hours, possibly get some LHS experience, maybe even some instructor experience. Those are the people whose long-term goals ensure a high staff turnover at any LCC (at least in normal times when there are multiple job opportunities). And then, there are the others who are not planning to move on because they value being based in their home cities more than the prospects of higher pay and better treatment abroad. No judgement passed here, everyone's priorities are different. I think that this is enough of an answer to the question of why people work for the big three regardless their downsides.