i definitely do!!! and the number i use is growing!!!!! always my turquoise ear rings ( mineral of riders) or my pearl ear rings. then i have (lucky underware :) ), lucky red sox, now a lucky belt with my very old western belt buckle i won. i always eat boiled egg for breakfast - lucky breakfast!!!! silly eh!!
I think it is human nature to do luck enhancing actions. Everyone has a different style. There is a tradition amongst 3-day riders (my memory not sharp on that) to never use new tack- may not be accurate on the details there...