Have never heard of purchasing a lounge pass for points. Generally only admission is only allowed by virtue of being a Qantas club member, having status, i.e. Gold or above or receiving a pass by virtue of Silver status or a credit card offer.
We have lounge meet threads and if your flight coincides with an AFF member's flights they may guest you in.
The only exception I've heard of is a couple of years ago Qantas sold entry passes at Christmas but haven't seen it since.
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