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]
(..) look at this because he is running factory there donkeys are manufactured look there is your donkey so what I tell him? He can see profit in you thats why he is with you what the hell you think of yourself? What do you mean Suhaas is not interested in me? She lost the watch (..)2009 3 Idiots