Looks like this forum post got closed. I would really appreciate an answer from people who were trying to figure this thing out. Since, with the recent Oktoberfest in the USA quest, all the pieces of Holiday set are completed, thereby it giving a complete +100% luck bonus, which no other set in the game can give. Though, if you combine sets together, you can reach higher values of % luck/drop chance (using CW Horse set/Dancer set/AQ set etc.; but those would be different sets and then the point of different sets stacking together comes). Someone please clarify. Thanks!