In 1e there were two ways of gaining XP. Killing things and taking their stuff. And you gained about 90% of your XP from the 1GP = 1XP rule. This meant that the XP from killing things was effectively consolation prize - smart play revolved round taking stuff and fighting the monsters as little as possible. (This counted double for wandering monsters because wandering monsters did not carry treasure).
IME running an AD&D 1E game for quite a few yeers, this isn't the case.
The XP from monetary treasure, monsters, and magic are all of the same order of magnitude. Generally XP from gold, gems, etc is the highest of the three, with monsters next and magic last. This varies from adventure to adventure, of course, but treasure XP being ten times monster XP? I don't think I've eber seen it.
Maybe I'm just stingy with treasure.
