As a manager who has quite literally accepted/denied over 500 suggestions, while this might sound like a great idea to you guys, it ends up being a pretty difficult to do this. Granted, for the most part I tend to put a small (sometimes long or even a rant) on some of the suggestions, but I don't think I would ever want to put a comment on every single thing I've denied. Especially for the number of suggestions we have to facilitate, it already takes hours on end to go through them. I'm not saying we can't try to put a reason for everything we deny, because most of the time I try to, but just remember that it can be very time consuming to do so. We are just "gamers" too you know.
Obviously I tend to not post reasons on the ones that are either A) Really Really Really Stupid, or B) It's obvious why it is denied, or C) Like all -Supports. But for the ones that have a lot of supports and that I can't accept, I try my best ot put a reason.
That's also why I put two responses on some of them, I put my response, then I use our "button" that posts the Accepted or Denied, Locks, and moves the topic all at the same time. That's why we use the button in the first place, it makes doing the tedious actions very easy.