Let's do some maths.
Captain in low cost european airline makes 10000€ plus social, pension..., if any.
Let's say it costs 16000€ to his companie a month.
Copilot costs 10000€
Total 26000€ .
These 2 guys fly 15 days a month, 4 legs, 200 pax every flights.
They fly 15x4x200 = 12000 pax a month
26000€/12000 pax = 2.17 € per passenger.
For 2 pilots.
You rather buy a ticket 100€ with no pilot, or 102.17€ with 2 ?