I agree, every motor and everyone is beatable! It just depends on how hard you are willing to work at it. Unless you just have a huge pile of money to spend or a good sponsor, which i've never had. lol. Someone will always be the target and they will eventually will get beat.
Back to topic, we broke a Midwest super cub billet crank in one of our Kohlers. The entire rotating assembly was balanced and was very smooth, and with under 10 races on it. Sometimes it's just a bad batch of materials or a flaw in the hardening process making them too brittle. Some people run stock cranks for years and never break one. Never know in what we are doing.