If you trade shit coins, you will see yourself losing because they are too volatile. If you gain, you may later lose. Successful traders trade with less than 10 times of their trading funds. If you have $1000 for trading, using $100 makes you understand what trading is. If you use leverage, you are increasing the chance of you losing. Patient traders are more likely to earn.
You are right, a professional trader invests his funds repeatedly in various potential coins that are likely to give him good profit. But when one does short term trading with a shit coin it behaves like gambling in that sometimes one gets big profits very quickly and sometimes very big losses very quickly. Trading in shitcoin is like gambling whose profit depends on luck. Trading is not for everyone Those who trade must have patience market knowledge analysis skills everything
Shitcoins are easily manipulated because their market capitalization is low compared to those relevant coins in the market.
This coins do have u known devs and team that may not be reliable which is one of the reasons why they easily get faded in the market and their price are mostly used for pump and dump because it's easy to be manipulated.
Every traders need to know many of these coins so they don't mistakenly trade it and end up losing their crypto portfolio for trading the wrong coins that got dumped before their eyes.