Ways to make money from free culture

Advertising

E.g. Wikia. Get lots of users, show them ads.

Bounties

Like BountySource or (some other newer site whose name I forgot that claims to do it better). But see the problem.

Commercial License

E.g. Ghostscript, dual-licensed GPL and commercial. Or artists (are there examples?) who CC non-commercial their work, and also sell it separately.

Donations

E.g. those PayPal buttons you see on some webpages "Donate Now", or Bitcoin addresses.

Employment

E.g. Red Hat, and companies that support free stuff though it's not directly their business, like IBM, Google, ...?

Freelance

E.g. vWorker, Jan's business.

Fundraisers

E.g. those things Wikipedia runs periodically

Microdonations

E.g. Flattr, TipTheWeb.

Support

Sell auxiliary services around a free product.

What is free culture