@Hawker400: So why do you believe the company deal with invoices are ridiculous? The deal is that you are hired as a company and you will get paid more cause the company hiring you will not have to pay tax for you to the state, and you can pay less tax also. Why should it be ridiculous that pilots working for one company should be able to pay the same tax as 100s of thousands of other professions in that national state who deliver their work as companies. Why do you believe a pilot should have to pay more tax than for example a doctor does? Where is the logic that you should give more money to the government because you work for one company? So if the national law allows for it why should pilots miss out on their salary?
I believe everyone should have choice of how they prefer to be employed and what kind of risk they can take in exchange for a higher salary. Why should pilots from EU have to go flying in Dubai or other places in the world to get a higher salary instead of being able to choose a scheme with a higher salary here in Europe? And it is actually cheaper to have your social security fixed by insurance than by the state since the state use the tax to everything from fancy toilets to administration while the insurance company does not have to spend on so much different things. Just check the price for a really good insurance.
And for the last part that you speak about "can race them a lot faster to the bottom and find employees who will accept the absolute least" why would that happen on company deals rather than normal employment deals? If the companies could find people willing to work as pilots for almost no pay they can legally employ them as employees for like 2100 PLN per month in Poland or even less in different other Eastern European nations. So its definitely possible to "race to the bottom" with employee salary deals just if the pilots accept them. The only difference between company and employee deals are what you are giving away to the state in taxes both you and the company......
As for SAS SAIL I believe those rules there are different than company employment in Poland by LOT or Ryan Air Sun since its something like the Switzerland deal of Wizz Air?