We also noticed it virtually empty when we were there other than for the fireworks of course. My comments about it and why I'll not go out of my way to go up there again is A: most of the tables are high-tops and not comfortable to "lounge" in. The comfy places always had people in them. B: neither the bartender nor the waiter were remotely helpful. We could have walked out w/o paying because no one payed any attention to us nor asked if we wanted anything. We had gone up and gotten our own drinks but the bartender wouldn't take our money to pay for them so we left it sitting there on the bar for 15 minutes while we took a high-top a few feet away. We finally wanted to go and had to try pretty hard to get the waiter's attention to tell him we wanted to pay. No one asked if we wanted anything else. I mean, if they want to make money, how about having someone ASK people there if they want something? The few others that were there were having desserts but we just sat there, ignored. We would have ordered desserts if they had asked, but we just got annoyed instead and went back to our room and ordered room service desserts.
Of course, experiences may vary, but that was our 3 weeks ago.