It might be "fun" to hybridize things to find out what you end up with, but it is not "fun" anymore when pure species start disappearing because of it. Like I said, look at the cichlid hobby, you will see what I mean.
Like Wes posted, if it was a "project" to see what hybrid pairings produce and if he kept all of his offspring from such as, it would be different.
For one, he is producing them to make a profit. Secondly, they are being sold to people who may breed them later on and sell them as a pure species. Third, he is using hybridization as an excuse to cull healthy animals.