I noticed that a lot of GitHub accounts only have repositories which are forked from other accounts. In addition the people who do this usually don't make any contributions to the forked repositories.I've heard of people collecting stamps and seashells, but why would anybody want to collect repositories? Personally I would only fork a repository if I wanted to make some changes to it.
Why do people fork repositories on GitHub?
github;repository;forking
In our line of work we tend to look for technical reasons, but in my opinion the primary reason isn't technical.  If you look at GitHub Help or other GitHub tutorials, forking a repo is one of the major steps for how you do GitHub. When people are learning and evaluating GitHub, just about every tutorial out there is going to tell them to fork a repo as part of that learning process.  Since the primary purpose of GitHub is to contribute, a lot of people working through the standard tutorials don't realize if you just want a read-only clone you don't have to do a fork first.