Hmmm....I can't say I've actually met that fella. I know that there is a rare boss in Act 2 Oasis (can't remember the name) that I personally think is bugged, as he only drops the very smallest amounts of gold, maybe a white or a blue, but his drops are drastically disproportional to other rare bosses.
The fat guy with all the skeleton minions that comes up out of a small puddle.
How many times does your sample include? 2? 3? More?