If you are 30-35 it worth it without doubt, exp on the berserker is nice, and the quest also gives great exp... I gained two levels doing that... At 51 your mileage will vary... 2k at these level is not much... Some guild also provide this service for their members. You won't get exp out of the berserker but you will probably get tiny bumps with the quest.
As for berserker rarity,
there's large ruins south of the chasm that spawns lots of berserker and a few wanderer near but 124 still will take sone time
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