You can only do the raid and such once a week. But if you make an alt with the same class you can get it to level 20, transfer your items over, complete the raid again, transfer loot back to main. Getting to level 20 is easy than all your gear gets you to 26+ so you really dont have to do much else. Should you only be able to do the raid once per account or does this seem right?
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This isnt an exploit, thats why theres a vault and why it allows you to do it on a different character. For example, I use my warlock to finish the heroic for 3 strange coins, I switch to my hunter and do the same, then I put the coins from the hunter into my vault for my warlock.