She acts so high and mighty that she hits it off with a SA, but serious customers use spare money that they have lying around their accounts. Look at purseforum, those are the ladies and gents that truly see Hermès as a luxury heritage brand, that they buy Hermès because of the history, not because it's trendy.
They don't sell other bags and other possessions to fund their spending. Sure, collecting Hermès might be quite revolting and all, but she's gonna be laughed at by those VVIP customers. And these customers also shop at other stores, they don't rely on vouchers to get things what they want.
She can't even afford to fund her wedding, what more her Hermès bags?