Everyone contributes.
We’re lucky to have a good venue - a restaurant with good food and service with a private room that allows BYO.
Most of the attendees have been interested in wine for decades and have deep cellars.
But more importantly, would have bought wine decades ago before current interest from the East (Japan, HK, Singapore and China) drove up prices exponentially.
When I started work in the mid-70s,
a bottle of Grange or Hill of Grace was @AUD$20.
No way will I buy at their current prices of >AUD$1000 per bottle