RuneScape private servers weren't meant to make people money, and they never will be. If you want to make money, go out and actually get a job and earn your money.
Your logic is flawed endlessly. Do not host a server to make money, it is wrong and against the law. While reading this thread I have thought to e-mail Jagex personally and discuss the private server situation and get their side of the story, so to say.
Besides it being wrong and illegal, making money "hosting" servers is not only morally wrong and unaccepted widely by a large amount of RuneScape server programmers, it is next to impossible because there are always antagonists and firewalls, so to say, that will prevent you from doing so.
Hundreds, no, thousands of servers have been hosted in the history of RS emulation and only four to six of them have been able to make money for profit. What they do make is surely nothing close to being able to live on, that's for sure.
Most of the people who have hosted servers and made money have done so incidentally, meaning that wasn't their intention. If it was they have failed. If it is, you will fail.