I wish you could sell alchemy cost resets. What a useless item! If you use it, it eliminates any progress you made towards the daily quest, so no team XP, and who needs gold instead of diamonds? I'd rather have raid tickets than these silly things.
Boss battle resets are hugely useful if a boss battle is running and you're trying to level up team XP. I think you get around 1,550 team xp every run through. I was using diamonds to reset mine for a while; it got me to the team cap really quickly.