Is that 6483973064837388393 some special account?
it has had at maximum ~ 3 Million NXT, but it has earned fees almost double than those 50 Million's accounts.
I recall this was mentioned way back when alias-system was implemented and the rush for potentially profitable aliases started. For some reason, intentionally or by mistake, someone had set an enormous fee like over 100000 nxt to get just one alias. And one lucky guy, can't remember who it was but one of the active ones here, he was just lucky enough to forge that crazy fee.
That was C-f-B itself, who have forged that lucky block. AFAIR, he returned most of fee to alias issuer.