Should I use a coupon code in my ad copy?

[reallygoodstuff]

It's been years since I've had a discount I could offer over PPC. I remember when I was a young search monkey, that companies would offer the coupon code directly in the ad copy. However, an inspection of ads on various queries, I don't see anyone doing this.

I want to, because of course a concrete offer should certainly help CTR right?  But, not finding any referent examples of other companies using the coupon code freaks me out. Is there a drawback to posting the code directly?

[john4math]

Looks like you asked this question twice... some answers are over at http://www.seomoz.org/q/should-i-put-a-promo-code-directly-into-adwords-copy.

[reallygoodstuff]

you are correct. there was a bug and my questions weren't posting. thanks.