I place myself in the first category. I am going to have to start committing my code samples to github, because 90% of what I write is proprietary and of no use to anyone but my clients and when not bound by NDA, the code would be a waste of other developers' time and would be on github just to be on github, since I and my employer have our own repos. Whenever I'm interviewing I end up pulling code from larger projects and coding a fake context around it to create a sample. I'd love to be more active in the OSS community but I have frameworks to learn, a 10 hour a day job and a wife and kids. No new job for me.