Do writers need some help?

Lunar BBDO poses an interesting question: Should writers get "professional" help to aid their writing? They note that most other professions use specialists for specialized tasks but copywriters rarely turn to comedians to humor things up or other experts to help achieve whatever tone / style is desired.

I suppose one way to look at it is that copywriters are the specialists since writing for advertising is different than other forms of writing. But would a TV writer help you do a better commercial? I don't know. Thoughts?