Question about crowd in Tulsa

I drove down from KC to see NIN and had a lovely time, but I had a question about the crowd. I was in upper bowl and it seemed like everyone in the upper bowl and even some in the lower bowl were sitting for the entire show. Is this normal for Tulsa? I wasn't used to sitting for the entire show and it seemed very odd. A few people stood up for head like a hole but that was it. I still had a great time! it was just unexpected.