Beg to differ there, Loki.
We bought several sets of dice for all players, so they don't have to passed back and forth across the table all the time. This reduces the time we spend looking for them on the cluttered gaming table, too.
Maybe these dice used are skewed (ie a so called 'unfair' die in the mathematical term, as in 'an unfair coin'), so they actually could produce a (slight) margin of error. Maybe. Or maybe it is selective memory. But I 'personally' would swear there was someone out there to get my players.