its a sliding scale based on what each girl has. every girl is a keeper to someone. you're gonna have more men that feel she's a keeper depending on what that girl has. things like good p*ssy, being funny, and loyalty can make up for bad attitude, overly clingly behavior and low IQ.
you can be ugly and wifey status or beautiful and for the streets
just for me personally though i really value intimacy... i can't get that from anywhere else but a keeper. so if she cradles the back of my head like a baby after sex and nibble on my ear while we're at the zoo... I'm jagged edge status.