 Why was the Vegan not chosen to make the trip to Earth?
Getting specimens for the interstellar zoo was no problem—they battled for the honor—but now I had to fight like a wildcat to keep a display from making a monkey of me! It was our first day of recruiting on the planet, and the alien life-forms had lined up for hundreds of feet back from my rented office. My three staff men, Auchinleck, Stebbins and Ludlow, walked shieldwise in front of me. The aliens came in every shape and form, in all colors and textures—and all of them eager for a Corrigan contract. The Galaxy is full of bizarre beings, but there's barely a species anywhere that can resist the old exhibitionist urge. I ducked into the office, took my place back of the desk and waited for the procession to begin. The name of the planet was MacTavish IV (if you went by the official Terran listing) or Ghryne (if you called it by what its people were accustomed to calling it). I thought of it privately as MacTavish IV and referred to it publicly as Ghryne. We had saturated MacTavish IV with our promotional poop for a month preceding arrival. Stuff like this: Want to visit Earth—see the Galaxy's most glittering and exclusive world? If you are a non-terrestrial, there may be a place for you in the Corrigan Institute of Morphological Science. J. F. Corrigan will hold interviews in person on Ghryne from Thirdday to Fifthday of Tenmonth. His last visit to the Caledonia Cluster until 2937, so don't miss your chance! And the Corrigan Institute really packs in the crowds back on Earth. It's the best of its kind, the only really decent place where Earthmen can get a gander at the other species of the universe. There was a lidless eye at the top of his head and five lidded ones, one above each arm. "Before we begin, I'll need certain information about—" "I am a being of Regulus II," came the grave, booming reply, even before I had picked up the blank.
 The upkeep for the species was too much.
 There were too many of his kind already in inventory.  They were worrisome and difficult to work with.  He was much to large in size to accommodate.  The upkeep for the species was too much.