My casual round playing partners could care less what I carry in my bag. Most of them play in the same tournaments I do. So, they know if I carry an extra club (15th) and become used to having it I will be at a distinct disadvantage come tournament time.
When I was experimenting with different hybrids, I had more than 14 club in my bag. Same goes for putters. But, when it came time for another tournament, I had already decided what 14 clubs would remain in the bag.