One can argue that it encourages a man to hit on her, not by increasing his valuation of her, but in decreasing what he perceives her being valued at. Rationally, a man should pursue women not on his valuation of her, but on the degree to which he perceives his valuation of her as exceeding others' valuation of her.

Of course, this is a rather cold-hearted way of viewing dating, and Less Wrong is one of the few contexts in which admitting to being aware of this analysis is socially acceptable. For a lot of social interactions, one of the rules is that one not admit that one is aware of the rules.