To some,100-unit of bitcoin sounds like a big investment. To some,its a small investment.4 years ago, buying 100-unit of bitcoin was a small thing,but today is a huge investment and it's going to be higher in years to come. Below are some arguments on how one can start with nothing especially in cryto or digital currency system.
The good news is that the higher your financial intelligence, the more money you make without needing money. In this new capitalism, it is truly possible to make money for nothing.
Your last sentence is a bit abusing for blockchain - it sounds like bitcoin, eth and many other prospective coins are worth nothing even despite the fact that they use a revolutionary technology that could eventually change the world.
But on the whole I liked your idea about minimum investment growing to a nice profit - it is an ideal example of good strategic planning skills.