[Lucid:]

they're hard to find again if you're not subscribed to them. in the subscription list, they always show up (rather than disappearing when there's no new posts, like threads do) and they're at the bottom of the subscription page, so even when subscribed, sometimes it's harder to remember to check them. they don't grant gold either. of course, neither do profile comments or PMs, but those give you a nice big notification when you have a new one.