Would you say the same if there weren't any signature campaigns? Probably not. It's mind boggling how easily people think Bitcoin allows them to earn money, while in reality, that's not the case at all. It's always noobs very likely being a signature/faucet/bounty/captcha farmer who think like that. Earning Bitcoin happens by you offering a needed service where you get paid for in Bitcoin. Trading can also generate you a decent return if you know what you are doing, and even actual altcoin mining can generate a certain form of income. You either need to have skills that are in demand, or money that you are willing to risk in return for a potential profit. Either way, money doesn't fall miraculously out of the sky.