I think that most people here will tell you how much it costs to start! Making it profitable, well that can take a while~ years. I have been making soap and jewelry for 7 years. I have spent well over 7 grand. When people say test, they mean it. When you find a recipe for soap you like, and it works, that doesn't mean the testing is over. Soap can get DOS (dreaded orange spot) and your batch will be ruined. Lotion needs lab testing, hands down. But all in all, I think the amount you can make is limitless. Depends how you advertise, word of mouth, craft fairs and markets, internet sales, home parties, and impressionable product. Not an easy thing to do, but good luck with your venture!