I asked the SA today, she said mostly it's who the SA decides to make one. Usually someone who buys something at least once a month, and who buys limited edition stuff. There is no set dollar limit she said. So maybe it's just a matter of getting on a SAs good side?
If someone here is a VIP please correct me if I'm wrong. She also said it varies from boutique to boutique.
There is also a lady here they nicknamed "Kimora" bc she has everything on preorder, anything new that comes in, she gets 2, in EVERY color, she said she spends $50 - 60 THOUSAND a MONTH ! I love LV, but I don't care how rich I ever become, that is just ridiculous!!!!