Cant get rich? Look at lets say an 0-5 with 20 years in? Basic pay. That doesn't include BAH or any other pay. Thats Rich to me.
Some people do join for the money though. I was 24 on my first deployment and made $80,000(tax free) that year as an E-5. Forget making more than my boys back home; I pulled in more than their parents. It really all depends on your Rate/MOS. If you're an E-2 chipping paint, you still make as much as a first year teacher(sad but true). However, if you do Nuke, intel, or SPEC-OPS you're getting extra like dive pay, jump pay, HDP, etc(for SPEC-OPS)... I don't even wanna go into the ridiculous amount of perks and money Officers make. But they are definitely held to a much higher standard. I'll end with this. The experience, travel, friendships, and college opportunities heavily outweigh the paycheck. I did my entire masters in the Navy and didn't pay a single cent. My child will be getting my GI bill, so thats another thing not to worry about.