These may well be factors, but the real question is "Are LCC's under more pressure in this regard than other carriers?"
They are the driving force, so I would imagine they are under more pressure than your established carriers.
That said, all carriers are under that pressure now. This you cannot deny, is as a direct result of increased competition, competition that has increased, with the advent of the LOCOs.
Where does safety stand in such a competetive enviroment?