Because very good looking women have won a golden ticket in life, and until they hit the wall, can coast through life on their looks alone. The drawback of this is many (not all, many) very good looking woman don't try to work at developing a pleasant friendly, playful, engaging personality, or any morals and ethics. Instead some (not all) become narcissistic, catty, *****y, entitled drama queens and attention whores.
Gender stereotypes haven't been leveled. Men are still expected (not as bad these days, but the expectation is still thereto some degree) to do all the chasing, risk constant rejection, pay for dates, man up and make the first move (and risk being played for **** and giggles, or worse get hit with a sexual harassment claim) etc. Even confident men have to work at getting into a good relationship, or hooking up.
Very good looking women, just need to be very good looking.
80/20 rule, in very rough, crude number terms. 80% of women will be after the top 20% men in terms of SMV. 80% of men are left to competent for the lowest 20% of women in terms of SMV. Or people compromise.
So I'm guessing confident men, meaning men who have reason to be confident; ie self respect, perceived high status due to previous successes, rather than confident due to braggadocio, or cocaine and alcohol, are not shy around very beautiful women at all, even if it comes across like that. They simply have more options and have realized many of these women are not worth the hassle of a really bad attitude. They are not interested in chasing goldigging headcases.