Many people use altcoins for investment purposes because it is possible to earn more money on altcoins that on Bitcoin.
When market rise the price of altcoins rise evern more then Bitcoin and such big rise attracts a lot of attention.
Investments in altcoins much more risky that investments in Bitcoin.
That is why it is necessary to check all the projects where your invest money.
It is very important to evaluate the potential of the project before investment.