No, everyone is not interested in criminal law, and what about law is interesting to you? I’m a lawyer and don’t find “the law” inherently interesting; the last thing I’d want to do in my free time is read about law. I like being a lawyer though because you can help people navigate though red tape and other rules and accomplish what they want, and in the process you can outsmart people and win, which is particularly appealing when you’re working across from a bad person. If that appeals to you, then actually being a lawyer might be appealing.
Yes, law is a field in which you can earn a lot of money if you stick with “better” law firms or in-house jobs at larger companies. It’s nice being an “accredited investor” already at age 27, which is what 1st or 2nd year associates at large law firms are.
The best major to prepare for law school is a major in which you earn great grades, so be sure to take only classes that you expect to get As in.