On the subject of dues being required to pay for full-time guild leaders as brought up in the sibling comments, that makes sense. But could it be supplemented by crowdfunding and alternate pay models, instead of mandating a set price? Tiered membership? Freemium guilds? Free 2 Protest?
On a less semi-satirical level about startups, hackers already voluntarily contribute willingly to non-profit endeavors, namely open source projects, and sometimes causes such as Wikipedia/Wikimedia, the Internet Archive, even tech-related lobbying like the EFF, etc. Surely some could put that same spirit of voluntarism towards supporting their labor class.