No, the state negotiates as low price as possible because the national health service is given a certain budget that they have to fit in. The difference here is that in US your insurance company might say that they will pay 50% and you have to pay the remaining 50%. In Poland the national health service would never offer you such a deal. Either it's fully covered or it's not offered at all. Therefore companies are willing to lower their prices so that the government accepts their medicine at all, rather than having it rejected and not offered at any of the hospitals.

And the last time I checked the treatment with Glivec is a lot more expensive in US than it is here, so this system must be working at least partially.