If men had the choice of messaging one supermodel-looking woman per month (with no guarantee of a reply) or, say, four better-than-average-looking women, I think eventually they would learn to be more realistic in who they approach.

In any case, if the supermodels can set this spamminess/selectiveness parameter for themselves, they can tune it to a value where they don't get clobbered (unless they like the validation of being clobbered).