This is very true. At one point I managed a bit of money in a Wells Fargo PMA. It was fun to dress and groom similarly to The Dude, wander into branches like I was lost, and get treated like crap until they looked at the screen. Invariably they quickly summoned a manager to whisk me away to an office and asked if I wanted coffee, and their demeanor immediately changed. It became a personal hobby of mine for a while because they very obviously treat the "normals" differently than Premier accountholders. (Doesn't work at my new bank, sadly.)
I'm sure a number of folks here retain balances that far exceed my own at the time. Try this sometime. It's a fun psychological demonstration.