Don't Hassle My Look - It's Designer, Baby

So, my Mum calls me up from t'other side of the world and tell me she's purchased this 'toy' poodle (kind of a misnomer, because while this creature may be seen as a mere plaything, it is an actual living, breathing - and apparently wee-ing - creature). So I'm kinda shocked considering my Mum's class taste in previous family canines - proves she gone all sub-urban - that's cool, she's in her late 50's, she's entitled.
Anyway, Opal (pictured, with the bad fringe and jumpsuit), it turns out, is to be the Queen Bee of my Mother's super designer doggie breeding empire...
What?
My Mother is to mate 'Opal' with another posh doggie, but of a different breed. What breed you ask? Schnauzer. What do you get when you cross a schnauzer and a poodle?
A damn fine conjoinulation, that's what, and $800 'Schnoodle' puppies.

Turns out dog breeders quite like, ahem, 'conjoinulating' dogs these days:
Cavoodle: Cavalier King Charles Spaniel + Poodle
Cockapoo: Cocker Spaniel + Poodle
Labroodle: Labrador + Poodle
Pekeapoo: Pekingese + poodle

If anyone can tell me why it's always damn poodles I will be most appreciative.

My theory is that they choose the mixes based on the quality of the conjoinulation, and that the double 'oo' sound in poodle is cutesy and irresistible to the type of people who sit around deciding on what dogs should have sex with what other dogs.
As an afterthought - I would also like to think they use the respective sizes of the breeds as a factor when considering these things.