Oh, and when I was mowing the lawn, I thought of an example that hits closer to home for me, and maybe is a good comparison. Craftsman wrenches vs. Snap-on wrenches.

Both are forged steel with chrome finish. Both have lifetime guarantees, but a Craftsman is significantly less than the Snap-on. Why is this?

They both will tighten, or loosen nuts / bolts. This is not subjective, so why is Snap-on or Matco the "professionals" choice over the weekend warrior Craftsman?