As the day passes for the FL lounge are $150 or 15,000 miles and not heavily advertised, they are significantly less popular than the AAdmirals Club day passes. It doesn't surprise me that a less experienced lounge worker wouldn't know about it.

Similarly, it seems that very few people know about American's Five-Star Select service, which at $800 for two people is a fun treat for those who can afford it from time to time. This service gives access to Flagship Dining and can also be purchased with miles, though it takes an awful lot of them (something like 90k - could be off a bit).