Since reaching Gold and Platinum with Qantas. I flew CX,QF and AA in different classes, 13 flights in total so far....
Some pax always have the Customer Service Manager (CSM) greet them for their loyalty to the alliance/airline everytime they fly. Oddly enough. I got nothing. Maybe I'm just jealous.
Just the other day flew CX HKG-BKK in Y, there was a lady 2 rows in front of me a CX Silver being greeted by the CSM, where as myself a WP and my mother a CX silver never get on the list they run around in... soo... it kinda lead me to a conclusion that there must be an A list WP/SG/PS and a B list WP/SG/PS with some of the OW carriers...
A list being people that actually spends cash on J and F
B list being people who spends much less then A but still WPs
As I said, maybe I'm just jealous.

as I have no evidence to support my claim

I say not all Platinum is equal.
Another useless thread about nothing