Very true. But granted, most of the people who were the problem last year (i.e. the ones who were standing in the middle of the dance floor talking, or just doing non-ballroom dancing) probably knew they weren't ballroom dancers and went for either the dressing-up part, the prom type dancing, or because their other non-ballroom dancing friends wanted them to go with them. So if those people saw that the first couple hours were just for serious ballroom dancers, they'd probably understand and just come later when then can jump around and caramelldanse and stuff. This would result in the first couple hours being at least less crowded, even though there will always be shenanigans.