Well honestly, what do you expect when you send in a suggestion by e-mail to a big company? They probably get swamped with them, mostly of this sort: "Can you make your next phone more awesome?" "Nokia should make iPhones!" "You should add a 17" screen, and a laser, and a bottle opener, and a pony, and a...". If companies personally answered all of the inane e-mails they get, they wouldn't have time or money to actually make products, and sorting through the inane e-mails for the good ones takes too long.
I'd be inclined to believe that what goes on in this forum has more effect than e-mailing customer service with a suggestion. (Which isn't to say it has much, but you get my point...)