I know what you mean, living on communal/ non owned land, building and working on that for no gain is fine by me, working to build someone's eco-office which they will then be the sole enjoyer of, no thanks.

I remember on my Permaculture course 10 of us rocking up this detached house in Lewes, a very pricey green town near Brighton and designing the garden for this wealthy couple. I just kept thinking 'fair shares..'?