The reason you have to be +18 is you get paid.
Want to be a mod? Want to spend hours a day not getting paid while helping your fellow players, catching cheaters, hackers, scammers and muting people who use abusive language?
If you answered YES to either of these questions, then you should probably check yourself into the nearest psychiatric hospital as soon as you can.
It's obvious Demi-Mods would just want the benefits of a Mod. That's why the staff say no to anyone who asks "Can I be a Mod?"