Archers are even more anal, due to weight differences being critical to the overall results. When I was competitive, I weighed all my arrow shafts and points in grains (I may have weighed the nocks as well, but can't remember), my strings, we measured arrow speed and were picky about getting matched sets of arrows. Some guy put together a table of all the weights of all commercially available Olympic style bow handles from the 90s/00s. There is a place in Germany called the Beiter Centre where they have an archery range with highspeed cameras set up all the way down so you can analyse your technique and arrow flight. I think any sport that requires any kind of equipment will attract those who will be meticulous about these things.