It's a problem but it's also an opportunity. Maybe I should only look at pitches from founders under 6ft, since I'll get a bargain playing off of people's dumb instincts.
That called being a contrarian investor, a successful strategy at times, but investing is "Keynesian beauty competition". To win such a game, one must bet on the contestant that one thinks is considerate most fair by all, not one's personal preference.
There are key differences between startup investing and that model. You just have to get sufficient amount of investors to recognize the diamond in the rough. Not a majority or anything near that. With enough money you don't have to convince anyone else.