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.
Yes, that is always the mantra in investment. Do not put your egg in one basket, and it work too since if you lose on one investment there are others that you can recover. Even small investment if they are many and as long as invested in reliable coins, it really matters.