To me it depends totally on how you've achieved your Big Zero.

If you've gone about your career without perceptibly ducking anybody and happen to finish undefeated....... more power to you.

If you, however, have picked-and-chosen.... carefully picking your way through your career.... preying on smaller, older, more inferior opposition, while ducking or letting big fights "marinate"..... then your Zero is worth squat.

Mexican Ricardo "Finito" Lopez was a great example of the former. He finished undefeated, and took on all comers during his career.

Mexican Saul "Ginger" Alvarez is on the opposite end of the spectrum. His Zero ain't worth shit. He's also a previously suspended cheater and weight manipulator to boot.