I actually heard the opposite in terms of big spenders getting priority. It seems the stated policy is that it goes by sequence of who ordered the piece first, your spend does not matter (spend matters in terms of getting offered “special“ pieces like the rock crystal, pietersite, etc.).
I think the main difference is our information may be how the SAs are choosing to handle their clients. I have observed that the boutique I shop at hews very closely to VCA HQ policy and does not go ”rogue”, whereas some other SAs may try to leverage the stock issues to their advantage. Hence you hear more and more people commenting on how VCA is becoming like Hermes in a bad way.
My own take is that VCA is very bad at managing their supply chain / production efficiency, and some SAs are taking the opportunity to play games