Well yes as above really, they do not have to.
The company (Particularly CHC) wants the most productivity/flexibility/least costs possible and will only give what they are forced to give.
In Den Helder the pilot group has not pushed anywhere near as hard as the other pilot groups within CHC so they do not receive such a good deal. The Norwegians show the way, their unions do not mess around and get really good deals. There is a new negotiation looming in Den Helder but rumour has it that the union (it is basically a fixed wing union with the heli pilots added on) is not being pushed hard enough to get a good deal for the pilots there.
Whilst the pilot group there does not seem to be ready to push and get a deal that is representative of the current offshore market in the North Sea (Plenty of work/Lack of pilots), the only saving grace is that with most other offshore operators offering equal time rosters the management there may actually want to offer it too in order to be able to recruit anyone! Unfortunately they will probably maintain something akin to the current deal and that is you can work equal time but get far less than a normal salary.
Hopefully before the new negotiations the guys and girls there will cotton on to the deals that are being negotiated elsewhere on the North Sea and get themselves a good deal. They always seem happy to be catching up with the rest of the North Sea never leading the way, shame really.
I hear the Norwegians have just negotiated another great deal. Maybe they could help the poor Dutch out.