[JohnBooty]

This contradicts reality as I have experienced it.

I think people tend to select people they perceive they'll actually have a chance with. Obviously, not everybody has a good handle on how desirable they are (or aren't) but generally, yeah.

Your logic -- which sounds a bit like incel logic -- also kind of assumes a 1-dimensional scale of 0-10 based on, what? Solely on conventional physical attractiveness? Not everybody buys into that, at least not as a sole criterion.

I know a lot of "not 9s and 10s" who found relationships/hookups online.

I actually used to run a sort of dating site back in the day. Hundreds of examples on there, and I know many more people who've met partners online outside of the one I ran.

What you are describing is certainly true of some places like Tinder that lends themselves to quick impulsive swiping and snap judgements based on looks alone.