Investing in Bitcoin is like investing in shares of a company that produces nothing, and which only is able to fund its continued operations by continuing to issue and sell more shares once every ten minutes. Investing in a real compay that worked that way would be considered crazy, but somehow it’s supposed to be different because it’s decentralized. The financial implications are the same though; it’s a negative sum game instead of a positive sum game.
That’s why it’s more like gambling than an investment. The amount of money that comes back out is always going to be less than the amount that goes in, in the end.