Sure, but to say that they favor humans as prey out of all the animals they hunt is speculation. All we know is that they visit this planet frequently. That doesn't equate to them having favoritism for Earth. The trophy room clearly shows that they hunt many other lifeforms. Worse comes to worse, there's an entire universe filled with prey to hunt from; I doubt this would be the first planet overrun.
I'm not saying they don't try to clean planets of Alien infestations out of pride, but it's hard to argue that they do that specifically because they favor humans.