Oh dear! I saw a large dog on a stroller bed the other day at a farmer's market and thought it was so silly. Maybe it has arthritis, but, I thought such a big dog could walk by itself- not like a little dog that might get worn out. My mom told me she once say a bird in a stroller! How ridiculous!
I definitely agree with the bed thing. Almost anything I buy for a pet they don't use. They'd rather sleep on my bed or somewhere random.
As for grooming, some dogs do need to be groomed to keep them healthy- like for their ears.
And treats... I might pay a little more for a specific benefit or if my animal couldn't eat certain ingredients.