The thing is, people like to save an LB and never use it sometimes. I've gone through entire dungeons where we only used the LB at the final boss because I was Tank or something. If I'm a DD, I use it at the beginning of the fight if the bar will not extend to 2, or if we do a big pull on something. There's no reason to hoard it like it's a 5 minute cooldown like Hallowed Ground. I even see some Healers never use Shroud of Saints at all and they get enmity from AoE healing. It's kinda awkward when you ask them "you have Shroud of Saints right? Because you're not popping it when your MP is at 75%, or 50%, or ever. So just wondering..."

Use it, or you literally just waste time storing up something that can't be used.