Selling T-shirts and other branded items a good revenue source for open source projects?

I'm trying to figure out how to monetize my open source contributions on GitHub.

Does anyone have any experience with selling branded shwag to people who use your repo?

What other ways can I make some money in open source?

Here are a few methods that we used back to create a stable income of money in a big open-source project that I was involved in:

• Charter Membership: A person registers and gets early access to premium versions / priority support of the software and pays a very fair amount of money per year.
• Consulting: You can make it known on your repo that you do consulting for the projects that you share freely.
• Paid Addons: You can offer some of the lesser critical and wanted features for a paid fee. Don't ever make the mistake of providing essential stuff for a fee.
• Integration: Charge people for integrating your projects to their existing software for a fee.
• Schwag: http://www.spreadshirt.com/help-C1328/categoryId/289/articleId/921 a great place if you lack the intial money to get your tshirts printed.
• Donations: Collect donations, you never know when someone will donate a three/four figure. I was shocked when we got one way back.