alexandrew, it looks like you are going on the Wonder on the 9th. Maybe you can scope things out in Palo's!
I'm guessing it would be different on the 7-nighter, because you really do have to bring a suit or a tux (or at the very least a sport jacket) for the dress-up nights. Most people probably figured they'd just go ahead and wear that to Palo as long as they had it along.
It could be different on the 3-nighter because no one might want to stuff a suit in their suitcase just in case they go to Palo.
IrishCowboy, I do see your point. Only sometimes practicality outweighs what we'd like to do in theory. Everyone traveling in our group has a child under 2, and we are all staying in FL many days pre- and post-cruise. It just doesn't seem smart to try packing a suit (and everything that goes along with it) if it's only going to be worn once over the whole trip to FL. There is too much else to worry about bringing and stuffing into the luggage. Everyone will be dressed nicely, just no jacket.