Well, two years in a row QF has successfully sucked me in and got me to book earlier than I would have for trips on my "might be fun to go there sometime" list, and in J.
Returned today from a SYD-BNE-APW-BNE-SYD trip (Samoa truly was the gem people say it is) and pocketed 480 SCs having booked during the October 2024 DSC promo for $2100. While we there, we booked SYD-BNE-VLI-BNE-SYD to give Vanuatu a go next year. That'll be 400 more SCs for $1750 return. In theory, you could earn/retain Platinum for around ~$5000 AUD with a few of those.
That said, the trip we just returned from today in J was a useful sanity check/reminder that paying many thousands of dollars solely to chase status for an average product and the lacklustre benefits on offer is not a rational thing to do (at least in my case as a primarily self-funded flyer), so I'm not going to succumb to the temptation to book more to chase Platinum just to visit the F lounge or maybe-if-I'm-lucky secure a few long-haul rewards in J on request.
But given the fares quoted above, I can tolerate paying twice the economy fare for one trip to guarantee I'll lock in at least SG status in my next membership year. The lacklustre benefits (and at times decent, e.g., AA Flagship Lounge in the US), plus savings on baggage fees and preferential seating on a number of OW carriers probably does balance things out, and we can tick off another "might be fun to go there sometime" place off the list while doing it.
Perhaps the eligibility towards lifetime status could be a driver, but I'm still too far off from that at this point to invest too much after too many years overseas locked into other alliances.