not all of us have the Zapp Brannigan's courage so we go in with smaller amounts.
i actually started my trading with a tiny amount of Dogecoins, it makes me laugh when i think about how small it was. it was about 100 Doge when price was ~70 satoshi back in 2014ish.
and i did the trading on Cex.io because back then they didn't have the silly 0.01
BTC min volume for trading. they didn't have any limitations. i was trading 10 doge at a time, buying low selling high just to learn the tricks
how much i trade now is usually small too and i made it into a vote