In the virtual crypto currency world only two hot coins I considerd which is bitcoin and ethereum, nothing doubt for that and this two couns can give more chance to get profits in the right time.
What you're right, but investing in the top 5 coins, you can not earn a lot, unlike small coins, which can in a few weeks or even days to bring wild profits. Most of the small coins will remain so, but 1-2% will go to conquer the peaks.
if you have a lot of capital maybe you can earn some good money with buy 5 top coin for short time