H_H,
I have no idea about this situation, if you'd like to PM me with some links to how it works and why, I'd be happy to investigate it further. My first inclination is to say that if the system is a voluntary one then "Rock On!, I'm glad it works for them." And, as such, is inherently 'capitalisitc,' by the actual definition of that term. If somehow it's enforced by labor laws or some other such thing, then my inclination is to say, "there is probably a better way."
A little term-defining is in order:
Socialism as an 'organizational' model is one predicated on enforcement of the model. As a system the desires of the individual are supplanted by an enforced 'collective' good. Enforcement implies a a mechanism thereof, i.e. a ruling class of Enforcers. Voluntary systems can look like socialism (people acting collectively), but if 'enforcement doesn't come through coersion (or the point of a gun) that is still capitalistic. Where "Socialists" (read most of Human History) have gone wrong in the past is in defining what they want as "Right!" and therefore, disagreement with that is "Wrong!," and down that slippery slope we go.
The voluntary process, Capitalism (Not the State-sanctioned Corporatism practiced in the US, previously known as Fascism), may lead to uncomfortable or 'alien-looking' conclusions but, IMO, I would rather that, and the attendant responsibilities that comes with it, than being told what to do by someone who has no clue how to run their own life, no less mine.
The more I think about a salary-cap the more I think it is a Budget than a price-ceiling, and in that sense can justify it as long as both sides can agree to it within the context of a level bargaining table, which current U.S. and Canadian labour laws will not allow for.
Ta,