I think it's an "eyes bigger than her stomach" kind of problem. Many women are attracted to the idea of a big dikk, not the reality.
Same thing with ass; a phat ass doesn't guarantee good box (it's hit or miss, IME).
It's about aesthetics.
Women love a big fat veiny dikk. Lol
Can they take that sht inside them? Probably not. But they sure as hell wanna see it, be next to it and maybe try it out.
Like you said, it's like nikkaz wanting a bytch with a big ol phat bubble ass. But alot of these nikkaz ain't even big enough to get pass the cheeks to get to the p*ssy. Lol
But they wouldn't mind rubbing on it and trying their best to find out