He 'profited by' his experience/mistake. [=he learned something useful from his experience/mistake]
The book can be read with 'profit' by anyone who wants to understand how the system works.
We sold the house 'at a profit'. [=we made a profit when we sold our house]
(..) My door is always open. Sounds good. Uh, I don't know about this one. He might eat up all your profits. Well, I'll let you finish your meal. Can I get you anything else? A refill, perhaps? No, thank you. (..)2011 TvShow: Breaking Bad Title: Problem Dog Season: 4 Episode 7