Ah, but links can work in the opposite direction. Hosting a project on GitHub can drive traffic to your personal site. To give two data points: GitHub is by far the biggest source of referrals for my personal site, and it's the second-biggest source of referrals for Floobits. Even from a purely selfish point of view, hosting on GitHub is worthwhile. People don't find out about Ag[1] because they know about me. They find out about me because they know about Ag. The incoming visitors far outweigh the exits.
There are many altruistic reasons for using GitHub. Users are far more likely to be comfortable with GitHub's UI than your own site's. It's much easier to contribute to a GitHub project than one hosted elsewhere. Many interactions (such as submitting issues) are standardized across projects.
There are many altruistic reasons for using GitHub. Users are far more likely to be comfortable with GitHub's UI than your own site's. It's much easier to contribute to a GitHub project than one hosted elsewhere. Many interactions (such as submitting issues) are standardized across projects.
Hosting on GitHub really does benefit everyone.
1. https://github.com/ggreer/the_silver_searcher