It's tough to put one's finger on the malignant result in a business using incentives to involve women in a hobby to which they might otherwise not be drawn.
Then you haven't really thought it through. Again I propose, consider what would happen if a business that attracts say 90% black or hispanic people offered discounts to white people to get their business. The backlash would be massive.
It only goes to show how conditioned we've become to look the other way when certain types of discrimination happen to one segment of the population, while crying bloody tears when the exact same thing happens to a different segment. We should be equally upset, not picking and choosing.
SAT scores is a bad example. If you want into the best colleges apply yourself and study to get the scores you need, or the scholarships. You can't however choose the sex you were born with or the color of your skin.