I stopped in one night after a Texas Tech football game (I'm an alum now living in Florida). Supposedly this restaurant patterns itself after Del Frisco's (we have one of those in Orlando so I specifically chose this restaurant when planning my trip). I realize I was arriving late (they stop serving at 10pm) since I had called ahead to confirm. When I walked in at 9:40pm there was no one at the maitre d' station, but I waited in that area for a while to signal my intention to eat dinner. Finally I migrated over to the bar when no one approached me; again no acknowlegment from the staff (mostly young guys who were preoccupied with the Notre Dame - Michigan State game on the bar TV). After a good ten minutes (quite a long time for a service establishment) I left and went to Abuelo's, a Mexican restaurant with fantastic margarita's and tortilla soup, among other things.
Maybe they are doing well enough that they don't need to make exceptions (or even acknowlege their guests) on especially busy weekends. However, if you don't want to bother with latecomers, then say so (or lock the doors or something).