I suggest heading to the membership service centre near old Casino (near Coffee Terrace) to do it.
The time saved is worth the walk. Enclosed walled up area, not convenient for people to jump queue without dozens of staring eyes.
At SkyCasino membership counter open-space, the queue headcount insertion (family member) extremely horrible, the tourist ones are even worst, one shot added 3-4, and processing rate is one person every 10-15mins per counter, with 3-4 manned counters.
Membership Service @ old casino: One U-shaped queue, about 50-60 people if room maxed.
(Picture show 50% full, partial queue hidden in inner room, but just one liner queue)
This is SkyCasino, with about 60-70 people in line.. you will see husbands, wives, kids, relatives, friends joining in the queues midway.