Canute .. are you a professional DJ or a professional picture guy (sorry .. don't know what your day job is called)? Seems with your definition, you couldn't be one for both, as a true professional would need to be focused on one area and surely there is no overlap between the two.
Not every one on this board is a full-time DJ only. Many, and I would suspect most, do this as a second job as you do. Doesn't make them any less capable, knowledgeable or professional, even though DJing "supplements" their income.