Some people try to pool local commits into larger, less frequent pushes and pulls so the number of push/pulls is perhaps less relevant than their cumulative size. But pushes/pulls will never correspond well with user involvement because people use github for all kinds of scenarios. For instance, I might be developing branches that I don't want to push or pull to github yet--maybe I don't even intend to ever make them public. However, I may still want people to clone from my github repo and report issues to me.
The amount of time between someone getting an email from github and re-activating their account is probably the best metric github will ever have on users' attachment to their accounts.
The amount of time between someone getting an email from github and re-activating their account is probably the best metric github will ever have on users' attachment to their accounts.