You need to reasearch about the coin you wanna invest.. some coins are pure... shit and some other have the potencial to be something special.. but this is no reason to be fool when you are investing your money you still can lose because the people maybe don't see the same potencial.
Indeed you need to think about the future it has if it has one of course and if the market can be profitable.
So long this is the fact it is worth investing in altcoins if you are asking me.
With a lot of altcoins in the market you cannot just blindly pick what to invest, you need to study them all and also consider the volume, the greater the volume the better as that would prove that people are trusting on their money with such project.
It is a fact that there is a lot of Alternative crypto-currency in the market and choosing one for you to invest is quite a hard to do. So the best thing to do is to find an ICO project where you can earn new altcoin on project through applying on a signature campaign and you need to promote and support the whole project for it to be successful. Then when you earn it depends if it will be successful and if it will be a good ICO you can invest with no capital in a money because you earned it.