Learning about bitcoin alone is already an investment because we don't do it for free. Those times we sacrifice, which could have been used for other things, were invested in learning about bitcoin, which I don't see as a wasted resource. I consider that time as something that was put to good use and could also be considered an investment.
 
If I don't have money to invest in bitcoin yet, that doesn't make my knowledge a waste. I can still continue to learn more about the currency until I can raise money to start my holding journey, but with the things that I'm able to learn about it, I can still use that knowledge to earn bitcoin without physically investing money in it, which is also one way that the information gotten from bitcoin can be put to good use. There are a lot of ways to actually earn bitcoin; all one needs is to have the knowledge, which is a good starting point, and capital to buy and start holding, which is what follows.