marketing or cost savings... but in the OP's case, if you had a business, I can't see anyone making a rational decision to lose $60k in exchange for the small risk of additional costs (if a bag went missing). As for the marketing side, the OP already flies QF or Oneworld enough given their speedy attainment of Plat status.

CIPs and VIPs expect discretion to be applied when it suits them. They have either the commercial or influential value to reasonably expect that.

While QF is giving out double status credits on the one hand (which certainly costs them money for aspects such as lounge access), they won't interline a bag on the otherhand.

Seems a bit strange.