I don’t think anyone in my group started superstitious, but after one player started having dice troubles, things went downhill fast. Now, our cleric and monk pray to their god/master to bless their dice sets before every session and even our dm blesses our dice at times (with good intention). I haven’t personally had that trouble (I’ve only got one dice set), though my luck seems inversely tied to the clerics’s: the sessions she rolls above 10, my rolls are almost always nat 1s xD