I also like this idea but it just seems difficult to get the business started and making enough money to compensate yourself. Just to be sure, I don't mean working from home for elance comes under lifestyle business.
Don't set the bar too high at first. Just aim to make "some money, greater than zero". If it's money you no longer actively have to work for, then congrats, you've got an income stream!
Do it again, and again, and you'll find that 1. You're getting closer to supporting yourself from it 2. You get a better idea of how to do it again, faster, cheaper
Do it again, and again, and you'll find that 1. You're getting closer to supporting yourself from it 2. You get a better idea of how to do it again, faster, cheaper