Good political ideas aren't proprietary because we want politics to improve people's material conditions. If somebody has a good idea for that, and a bunch of other folks say "hell yeah! me too!" then we have something even more valuable: consensus on a good idea. And anybody who refuses to share that good idea is left out in the cold because they've demonstrated their disinterest in improving people's lives in X, Y, or Z way.

Edited to add: I also don't believe that decommodifying things that we decide, together, are important components of a well-formed human life is the sort of notion that somebody (at least not somebody in the 21st century) can claim as their own.