1. There is a difference between "This is useful, I will use it," "This is useful, many people will use it, I think it is going to succeed," and "This is useful, I will invest in it." I have recently started using a text editor called Byword. I quite like it. But I am not rushing out to invest in it.
2. There is also a difference between "I will invest some of my money in it," I will invest all of my money in it," and "I will invest all of my money and all of the money I can borrow in it."
If we take a thousand people and instruct each of them to invest their life savings and everything they can borrow into a single, randomly chosen investment, some will get very rich, richer than anybody who avoids borrowing money for speculative investments, and much richer than people who take a balanced portfolio approach to investing.
But that doesn't mean it's a good strategy.