The guy was a hunter and degenerate gambler, so it's not like these would be out of the ordinary expenses for him. Given that he did $100 a hand poker, it's not impossible that the hotel comped him the room. A gambler is the definition of impulsive, compulsive behavior. The main thing you need to inflict lots of casualties is high ground and a target-rich environment. The 32nd floor is pretty high and an outdoor concert just about fits the bill for target-rich.
They would not comp him a corner suite on the 32nd floor on a weekend in September/October unless he was a high roller gambling Millions of dollars (yes, we have those here). $100 a hand poker does not get you that suite on a heavy weekend.