Pimps trying to catch a woman that's weak

Sylvester is a pimp, that much is clear. I understand Sylvester keeping a bevy of birds to lure in some johns, he's got to pay for all that stuff he orders from Acme somehow and honey-traps are as good a way as any. What I don't get is why didn't Sylvester just eat Prostitweety when he had the chance then go after Tweety once the smack in her body hit his system and amped him up into a raging killing machine? Maybe she was a robot.

Dark Shadows #34 (Nov 1975).