Personally I find it so much more fun to go to a ballgame when attendance is poor....then again I find most people are bozos....everything is so much easier when attendance is weak
I feel this way more about general admission concerts than sporting events. At a sporting event, as long as there are assigned seats, there's no worry about people encroaching on my personal space. And with a larger crowd, there's more enthusiasm and overall energy.
Some people want that crowd enthusiasm in a concert experience but for me a concert feels more like a personal transaction between me and the band (even though it's not.) when compared to a sporting event. Plus, at a crowded general admission concert even innocuous people are transformed into bozos.