I think it has to do with the idea of work. Some people associate work with discomfort and feel guilty if they have fun so they transform their projects on uncomfortable work like things.
Entirely disagree. This is not how a project is transformed but what a project is...
But indeed, maybe our common conclusion is that open source is not for everybody and it should have a warning on the box like cigarettes.
PS: you do have a point that it's all in your head: in many ways open source work is addictive! Time for an Anonymous Open Source Developers group.