In theory, there were always easy kills on the runways; there was just no one to harvest them. However, since vulchee is a derivation of vulcher, which is a bastardization of vulture, there was no vulchee, until we had the first vulcher. Likewise, the vulcher had no purpose, no target, no polar opposite... he was undefined.
So, logically, they both came into being at exactly the same moment in time. Like dark and light, they can only coexist, for one without the other is nothing.