yes in short term investment, small investment can sense, but if we talk about the large term investment, i do not think that small investment make any sense. if you are going for long term investment then you need to invest a good amount of bitcoin so that waiting for such a long time you can really make good profit and do not waste your time.
But there are big investment today that start from small investment?
There are lots of succesful investment today that came up from a small investment like cafeteria turned into coffee shop, mini eatery turned into restaurant, small store turned into supermarket, small bakery turned into big bakers with branches and many more. In investment, if ever you started on a small capital, make it big while on the progress so that the returns are increasing without harming the capital because the one that will be used will be the profits.Of course while doing that, have a self dedication that you must reached your target no matter what.