Dude, I'm not close to getting married, so I don't think of mahr.
But since you asked, mahr is the girl's alimony. Yes she should think of her guy, be nice, not ask for much, blah blah blah.
But seriously, if a girl is gonna sign this paper, that's ALL she's gonna get if things don't work out. It's a contract, not something pretty she can show off to her parents stating that she's married.
Once she signs this, she has to stick to it. She shouldn't go turn her back on her nikaah if things don't work out, and demand 50% in state court. If she wants half, she should state it in her nikaah. If she's happy with 10 bucks, she should state that in her nikaah. It's something that takes a lot of thought. It's a contract. A nikaah is like a pre-nup. It takes a lot of negotiating and thinking.
A girl should never be shy when deciding something like this.
Wasalaamzzzz
