However I blame the Agency they have obviously lowballed for the business.. with commissions paid to agencies not sure why these Airlines use them and just pay a decent salary instead.
Same reason as Norwegian uses agency workers for permanent positions?? No union to fight, no employer responsibilities, if they become too expensive - give them back to the agency etc. etc. etc.
The money you make isn't necessarily worse than mainline SAS. But you do miss out on many of the benefits, such as the social benefits of living in a country with high employer social security charges. You have no health insurance (other than at work), no pension contributions, no loss of license insurance, no idea about ID travel but I'd say unlikely? Sick pay I am not sure about either. Covered by the law of England perhaps? or Ireland? or wherever country you're hired in.