The main reason that people to buy altcoin is to earn money.
Now many altcoins allows different opportunities that allow people to earn money.
Many altcoins are use now for investement opportunities.
More and more people prefer cryptocurrency than fiat.
Investments in altcoins more profitable then investment in Bitcoin, but they are more risky too.
It is very important to check everything before investing to evaluate the future potential of the coin.
Not all the coins will be able to survive during the fall of the market.