Are the more/most attractive girls different in behavior publicly than other girls?

So at my college I've noticed that when I am working out at the gym or walking around campus that it's only the most attractive girls (not much room for error here, we're talking near flawless faces, lean hourglass bodies showed off by somewhat tighter clothing) regularly lock eyes with me and sometimes even smile. Never seen this with the average girls or the weird fatties.

Are these girls just more confident or friendly or am I just a Chad and those average or weird legbeardy fatties just not even bothering because they know I am out of their league?