DS8's favorite activity is a Pokemon club. They play the card game. It's like a bridge club for boys. They even do a potluck dinner with it. A very nice couple hosts it in their home once a month.
When I think of who DS8's "people" will be as a young adult in charge of their own leisure time, I see a group far more likely to do a road trip to ComicCon than to a sporting event. A lot of kid's activities are for sportier types.
I think parents probably follow their kids' lead more than they realize. If I was signing DS8 up for lots of sports he'd be miserable. It would be a struggle to get him to participate in an engaged and worthwhile way.
DS5 is a more rambunctious and sporty kid. He's happy wrestling and will go hard and get sweaty. We'll likely sign him up for more sports because he likes them and they make him happy.
