You know the pay going in, so, if it is not to your liking...don't apply.
OTOH, if one were single, no kids/mortgage/debt...it seems quite reasonable.
As a result of the low crewfactor they try to shift the financial risks and results of this bad planning on the employees back to keep the salary costs as cheap as possible and the companys profit high.
From a 'company' point of view, that is precisely what they should be doing.
Businesses are not organized for the employees benefit, they are started and operated for the investors benefit...like it or not.
And, I expect many won't.
