I usually use the 2 lessers on the top of Crandor Island. They drop decent loot and are usually available. Ouch! You can use each arrow about 4 times before it's gone. If you do it right, it's very easy to safely pick up your arrows. It would take you about 19000 iron arrows, without picking them up, to each level 70 or, only about 4750 if you did pick them up. Hope this helps thanks i guess i will just pick my arrows up and kill lessers