THey are not a scam on vgoldseller. They kill stuff to get you the money (the higher the level the quicker). Mostly, for higher levels they kill dragons.
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Edit: THey changed, now they use bounty hunter
to all who piss and moan about this it is your responsibility as the consumer to report any bugs or errors that might happen they dont have control over everything but of course theres nothing they can do till u tell them what has happened or hasent, dont be stupid, consider it a business deal like it is vgoldseller.com