I was going to say something like this. I was going to go with the, “Well, to sort of put the shoe on the other foot, think about all the strange complaints and suggestions–the ones that you think are extremely ludicrous–you’ve gotten from people attending a convention you’ve worked on the staff of.”
Each of those ludicrous expectations comes from a customer ready to buy the convention that they describe. And they think those expectations are just as obvious as your concerns about how much space is in the sleeping rooms.
And to them, a typical con’s offerings, the things they tout and are proud of, are just as unimportant as the granite countertop is to you.
*shrug*

Well, having worked in a hotel for many years, most groups put the greatest concern on such things as appearance and comfort. When it comes to capacity, they care little more than how many people the conference room holds.
But of course, every group is different and has special needs. And while our needs happen to be exactly what you described, Joe Manager has no way of knowing that…