I mean, it's not like I'm investing in something that provides a real value to people. It's not like buying land and charging someone rent, or cooking a meal and setting it down in front of someone at a restaurant.
Yes, I know there is a tiny bit of value in what bitcoin offers that the old systems don't, but even that can only be realized in a best-case scenario (price stabilizes for years on end), which is highly unlikely to happen.
Tell me why I'm wrong and why I shouldn't feel bad for making a lot of money off of BTC.
On balance, Bitcoiners are about the ugliest and most ethically challenged people around. (It should go without saying that there are exceptions of course.) Many of the most significant reasons to get into Bitcoin are unsavory (to deal with stolen loot, cheat on taxes, etc.) A large number of Bitcoiner's would have no qualms about stealing from you directly. The simple fact that one person put's another person's money into his own pocket is proof enough that the thief has some innate superiority and deserves to have the money. It's a dog-eat-dog world and it's proper and correct that the most ruthless and capable rise to the top. Fuck the rest.
Don't worry about making money off these people. The capital infusions are probably most significant from venture capitalists at this point anyway and they've got plenty of $$$ to give away. Donate some funds to a worthwhile charity if it bothers you.