Based on what data? If you’re talking about what happens on Tinder, that’s because men outnumber women 9 to 1 on the app, as well as most other dating apps. But people meet places other than Tinder. Just look out the window and you’ll see all shapes, sizes, and socio-economic levels of people coupled up. Plus, if women truly only would mate with the “top 10–20% of men”, the species would have died out long ago, and nearly all men would look like Chads by now. It doesn’t make evolutionary sense what you’re saying, and it also doesn’t fit what the actual data suggests. People do generally date others “in their league” so if you’re lamenting that you can’t get a date with a supermodel, that’s kind of an issue with expectations on your part.