Thanks. I did some more digging and the change log has some clues - on 3/7/2009 there is a note saying the XP gain has been overhauled, and there is an "optional" SQL to set the multiplier to 0.5. My guess is, either at this point or during the expansion they were emulating (Faydwer), the 0.65 multiplier was the best approximation to Live, and perhaps 0.5 was standard for a while before then. Definitely in the earliest eras it was closer to 0.3.
EDIT: Nope, that was the addition of AA/group/raid multipliers. So the mystery continues.
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