Not all hotels have lounges, not all of them have them on the top floor. Having a nice, convenient sign let me know they have a lounge and that it is on the top floor is a nice bonus that happens from time to time. You really don't need to think too much about it.
Last edited by Oxon Flyer; May 23, 2017 at 1:32 pm
Reason: Remove refence to unnecessary and personal side-discussion