People used to buy accounts with lot of achievements on them and then merge them into their accounts. You were able to do this even though the owners names didnt match. This was before battle.net though, but I wouldnt be surprised if there was something sinister afoot.
I just put two of my accounts on my wifes battle.net and gained 12k achive points I went from 6k to 18k. She is pve only except some old school 2008 stuff.
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