Dooglus is traceable, and when I tested his character on JD, a year go, he didn't change his personality if i had no money or a lot of money.
I made a point of trying not to know how much people had because I wanted to treat all customers equally.
I remember one Sunday afternoon when LiKaShing got upset that I didn't have 24/7 support in place and he had to wait 3 hours for the hot wallet to be refilled. That's the only time I can think of that a player seemed to expect special treatment because he was a "good customer".