They do listen but everybody is asking for different things. I didn't particularly want Laundry, Toddlers or University but both came top in online polls or petitions.
I wouldn't be surprised if they would pay more attention to Feedback or Ideas if they consisted of hundred, thousands with just one word and not a long post.
ie: Burglars
Free babies
Witches
Horses
Story Progression
I, personally wouldn't mind
Plumbing
Engineering
Farmer
Painter and decorator
Those that need the Sims actually to get their hands dirty.