personally, i think people are falling "out of love" with expensive crossbreeds.
If i was to get a cockerpoo, i would go for a 5th + generation one rather than a first cross, just so that the breeder can give me more information about their temperament, etc. that having been said, i guess there are people out there who would go for a 1st generation one.
i would have dearly loved to have bred from my lab (with another lab) but with all the unwanted dogs out there, no experience, and risks to her decided against it and had her spayed.