Oil pump shaft question

If it's a steel billet cam core, you have to use a bronze geared pump drive, which I'm sure are hardened, anyway. Nonetheless, it is possible to have a pump drive failure, so why scrimp there with an OEM style? Not cheap, but Milodon has them at a reasonable price - part # 21535.

http://www.summitracing.com/parts/mil-21535