No, not yet. I'd love for Kaggle to be a place where analysts can earn a steady income, but I think that is something for the future. Right now even the top performers do not consistently win prize money, so they'll need a job on the side. If they are top competitors then this is usually a wellpaying job and so they are competing for fame and bragging rights, not prize money.
At my startup I do predictive analytics on whatever data I can get my hands on. There is an industry demand for fast and scalable solutions, which I fancy working on. Also Kaggle indirectly gives a lot of commercial opportunities and exposure. Perhaps in a year I'll reflect back on a modest start with ML as a career.