QUOTE(sushi0 @ Sep 19 2011, 23:14)

I've gotten 0 while playing on BT/IWBTH so difficulty definitely has something to do with it.
That's a pretty weird way of thinking about things, it's definitely easier to complete thousands of rounds on hard than it is to do so on BT/IWBTH. More rounds completed simply equals more chances to get (rare) drops. If I played on BT constantly I probably wouldn't even get 3 artifacts a day, but playing on hard I can get up to 10-15. The figurines are no different, I think, they're just very rare.