Never invest all in one coin, make a portfolio.
I also follow this rules. never put all your money in one basket. Try to put some another basket. Where you would invest it depends on your research. first, do your own research.
If you have big capital, then I will also agree your statement. But the Op investment is $100 is this worth to split this $100 and to invest in different coins. I think no there is no use if he chooses shit coins. So better take some time and do research on all new ICO projects and come one final decision which project is going to give good profit in short time invest your money on that project. The risk is there, but without taking the risk, you can not do anything.