Leverage is an optional condition, it is just an offer in order to make it more profitable to trade and work.
The concept of margin is only applicable to trading with the use of leverage. There is no need in insurance when you trade on your own money, and no borrowing happens.
i have seen most of the beginners at their early stage of trading dont know its possible to trade with no leverage/margin, they always try to bring profit more and more by using high leverage and at the end of the day , they become loser.