I think 10$ is a small amount but if you choose the proper coin then you may be 2x to 10x profit for sure.
that's the way you can buy waves,voise,piller etc
I am pretty sure that the person asking the question would want to make their money plus have some profit from only a $10 investment. Investing that $10 into Piller, Voise or any of the newer coins that arent within the top 7 coins would be a high risk move since the price of those coins arent as reliable compared to those that been around for a while.
Investing $10 and forgetting about it would be a smart thing to do, just make a withdrawal when you remember that the investment was put in place. The top 7 coins is a smart choice.