Just off HOTS today after another great cruise.
We were surprised on the first night to find a crew member stationed outside the Diamond Lounge checking Sea Pass Cards for status.
The concierge, Elaine, explained that they had been having a problem with people trying to bring guests into the lounge, and giving her a tough time when she explained that it was only for Diamond and up members.
A crew member was there every night and the system was working well. We never had a problem getting seats, even enjoyed a very pleasant conversation with a Pinnacle who was there because his friend was not qualified for the suite lounge.
On formal night the crew member was also enforcing the "no shorts" rule.
The system seems to be working.