Whilst I agree with a lot of what you have said, in some cases, you can earn status with Qantas for less.
Eg, flying international a lot? It's likely you'll achieve top tier status on Qantas internationally and via partners for less. I consistently see flights to Europe for far less with QF and their plethora of partners.
Not to mention, no need to worry at 75% on QF operated or marketed requirements.
I only mention this as it is the Plat + thread, so we're referring to status

If it was all purely about money in the bank and not status, just fly JQ