Over on photo.net there is a good discussion of whether photography is a good way to make a living. The overwhelming response seems to be that it is an excellent hobby, but a very problematic career. It makes more sense to have a job to pay the bills; finance life, family, and photography; and allow you to treat the production of images as an artistic rather than a financial undertaking.
That coincides pretty neatly with my own intuitions about the matter. A few minutes on photo.net will turn up hundreds of top-notch photos. If the people making them are mostly warning of the difficulties of photography as a profession, it seems likely to be good advice.