We pilots are our worst enemies.
We have some 100 colleagues at CV who are selling their OFF- and VAC-days on a regular basis.
"Now it's the time to make money!" or "I make the same money as a captain!" [as F/O]
These people pass a dangerous message to the management:
"It is not all that bad" or "EASA FTL - no problem".
Quite a few of these get nicer trips than the rest of us which are even withheld by crewplanning to have "something nice" to offer.
These short sighted "colleagues" do not see the point that they pay a hefty price for their short-term greed with health issues and expensive divorces when their last paychecks are taken into account for the alimony they will pay.
As long as the company can count on these people nothing will change.
No roster stability and not enough crews.
I found this gem in the Middle East forum on a similar problem:
"wanna know why?
because we, humans, are stupid, selfish and greedy.
and we, pilots, are humans.
and that's why."