Don't forget Clarity gives ~8 mana more per tick (standing or sitting), which comes down to 80 extra mana per minute (or 2400 more mana per half hour aka Clarity duration).
What I find to be worth it occasionally on my caster characters if I am soloing is to bind at a hunting spot near East Commons (for level 15 those would be Oasis or Lavastorm) and run to EC to snag a clarity and then gate back to my hunting area and have 30 minutes of low downtime killing.
I am not sure if the run would be worth it if you did not have SOW though (SOW pots help with this, or being a class that has SOW).
Edit: Since your mana pool is probably around 500 at your level and you most likely use most of it to kill a mob that is like 5 free kills per half hour with Clarity. If average kill/med time takes about 5 minutes the run is worth it imho.
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