I'm pretty sure it's the corner loads with the stock wheels that cause these to break. With the stock wheels using washer lugs and being hub centric it is possible that they can move a fraction under high load, i.e. when pulling a 1G+ corner. This movement is getting transferred to the hub ring which simply is so weak that it fractures.
So far 100% of the failures are on front wheels that I'm aware of. On our cars the front hubs are under far greater stress than the rear and take the brunt of the car's weight under deceleration and turn in. I'm very careful about how I mount and dismount my wheels, I'm positive that it did not happen during that process.
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