Why?And this is worth it... why?
Ambush stagecoach: 95% luck
Ambush stagecoach with 3 pieces of holiday set: 95% * 1.06 = 100.7% luck
It's as much better than ambush stage as ambush stage is than grave robber, and 5% makes a huge difference in what you can find. In this case, the difference is Bowie's knife. Who knows what you'll find with 100.7%.