Gotcha! I just found it funny, however, because "a strong client-SA relationship" actually involves "pre-spend" anyway...
Taking the contentious word 'pre-spend', then trace its use and etymology regarding H and you may find 'existing customer'. It's been this way for 100 years, it's not new nor NYC only. Although knowing NYC, where stores can choose their customers, that tradition is all the stronger. I find SAs in Paris less supercilious, supposedly (in)famous for their attitude condescendante. The difference recently is the inclusion of longterm/short-term data on clients and SA's, SM's targets re. KPI but you may as well spin a little metal ball on a roulette wheel.
'Pre-spend' is used by people who want to be fast-tracked. Flashing the cash only ensures a newer client can 'commence play'. No-one can have a 'strong relationship', leat of all in NYC with their SA if their raison d'être is buying a Birkin or Kelly. Playing the H-game is as mannered like the etiquette in a 18C Courantte. If someone wants a B/K, they better learn to dance or trust in Fortuna.