Risk what you can only afford to loose so that your mistakes turn you to better trader.
You are right, but for new traders. Trading require professionalism, no matter how new trader begin, no matter how good they think they are, they will always lose until they have experience about trading. It is best for beginners to use funds they can easily afford to lose, but not for experienced traders
A small loss
Even
Huge profit
Little profit
You idea is also still good for newbies, but for professional traders, there are times the market will favour them after small losses. That is why it is good to use reliable cryptocurrencies like bitcoin for trading. If you know how to use the indicators like RSI, you will understand what I am implying. There are still many other indicators that are important, relative moving avalerage, exponential moving average and bollinger bands are all important indicators too.
Professional traders still even lose but their profits are more than their losses. They also trade with right mindsets unlike new traders.