I don't know what you assume of altcoins, if you assume,these are the coin other than btc, if yes? Than there remains no doubt that alts makes a lot of money for short and long term investments, you can check the potential of alts on CMC or coin gecko, by comparing the trading volume of BTC with top 50 alts coin. And than you will understand the power of alts and how much people invest in it to earn passive income