 Why were the beings readily applying for the trip to Earth?
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. The aliens came in every shape and form, in all colors and textures—and all of them eager for a Corrigan contract. 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. A Terraphile alien who goes to the extent of rechristening himself with a Terran monicker would work for nothing, or even pay us, just so long as we let him get to Earth. It was the isolationism of the late 29th century that turned me into the successful proprietor of Corrigan's Institute, after some years as an impoverished carnival man in the Betelgeuse system. Back in 2903, the World Congress declared Terra off-bounds for non-terrestrial beings, as an offshoot of the Terra for Terrans movement. Before then, anyone could visit Earth. After the gate clanged down, a non-terrestrial could only get onto Sol III as a specimen in a scientific collection—in short, as an exhibit in a zoo. At the same time, we had turned away a dozen ursinoids, fifty of the reptilian natives of Ghryne, seven Sirian spiders, and no less than nineteen chlorine-breathing Procyonites wearing gas masks. "I happen to be a representative of the only Earthlike race that exists anywhere in the Galaxy but on Earth itself.
 If was their only opportunity after the Terra for Terrans movement.
 They were looking for a way to overturn Earth.  If was their only opportunity after the Terra for Terrans movement.  They were bored of their lives on their home planets.  They were hoping for handouts.