Multiplying professional activities by financial necessity is not new. Not everyone juggles more than one professional activity for financial gain. Some want to devote time to their passions while working. Others want to put their experience at the service of several clients, or even test a business project before launching.
Bloggers often fall into that category. For example, my current paying job not only provides financial stability, but it also strengthens many professional skills and lets me grow within the computer industry. While my personal project, my blog, allows me to fulfil my passion and develop my love of writing. This is a passion I have had since high school. I need both to realise myself.
Research shows that people who are interested in multiple things, show initiative, get involved and are passionate about several subjects.