Never out your eggs in one basket. Rather spread them out so small investments do make sense if there are enough of then spread in different directions. This is especially so with altcoins. Depending on your target will depend on the size of the investment needed. You will be forced to start small if small is all you have so yes a small investment does.cwrtaily make sense even if it's just a starting point for others to follow.
If the amount of money you have available to invest is low it does not make much sense to spread your investments, it is better to try to concentrate your efforts in just a few investments so you get a bigger chance to profit from it by studying the market.