"Promo's good", at least coming from me, has always been sincere. There is however, a bit of a cheeky, but not discouraging or condescending tone to it when someone goes on an unhinged rant. Even if I agree with it, and I often do, and when I post "promo's good" in response to such posts it often translates to
>Woah, anon! Tell us how ya REALLY feel, why don'tcha? ;)