Thanks for your insight everyone. However I honestly think if there is no relation between SPG floor and Club Lounge access then the signage beside the elevator bank is hugely unnecessary. And it actually then comes off as more of a taunt! Why advertise to the SPG members on floor 14 with specific sign, fairly large (should've snapped a pic), that a lounge they cannot access is directly above them?! Especially when they've probably already realized that with the small inscribing beside the 15th floor elevator button.
I would love some clarification from Starwood Lurker on why that sign is posted at the 14th Floor elevator bank.