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Competition 'Racing' axes are usually pinned for safety liability concerns.
It's required in the Stihl Timbersports Series. It's not about making the axe last longer. It's about preventing an axe head from flying off into the audience. Liability.
https://www.stihlusa.com/stihl-timbersports/resources-and-training/competition-axes/
Throwing leagues also typically require pinned heads.
http://www.northlandaxemen.com/rules.php
http://forestry.sfasu.edu/faculty/s...php/conclave/physical-events/103-axe-throwing