This is a simple answer to your query,,,

With small investment/ or capital, buying altcoin with low price (let say below $20, or below $1) is more quantity w/c you can feel the profit after selling, unlike buying on higher price like btc, eth, zec xmr etc. .. 🤔😂

Day traders are getting QUICK PROFIT for their investment or capital.👌👍

Contrary,  Hodling the altcoin w/ a good future will be getting more profit in a week/month or a year.🤑🤗😎