Altcoins are similar to Bitcoins in the sense that they are both relatively volatile right now when it comes to their value. The more one invests into altcoin, the greater chance that person has at gaining a profit.
Greater profit when you trade altcoin but greater risk compare when you trade with bitcoin ! As for example , we can see many ICO that occur everyday in order to compete bitcoin with their way. Some of them are being made because they want quick profit and end with scam
So just make sure that you've observe your altcoin before try to invest ( usually based on community feedback )