Why is it socially bad to tell the truth about playing hard to get?

I know guys who many girls want and they always go after the girls that aren’t interested in them.

Its like if you're a 7 out of 10 and you chase after him, you become a 5 out of 10.

if your a 7 out of 10 and you are hard to get, you become a 9 out of 10.

Why is it socially bad to tell the truth about playing hard to get?
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