Check the flip side, which doesn't require one person's anecdotal experience as corroboration:
1. A portion of a high school's population regularly misses class time at a rate as high as one day per week, depending on the season, to participate in extra-curricular activities.
2. Those students are required to produce progress reports in order to participate.
3. Those students make up what they've missed by planning ahead or catching up of their own accord to meet expectations for continued participation.
4. Their parents attend their activities, right up to and including their unpampered progeny's graduation ceremonies.
5. Many of those parents are blue collar, might occasionally go to Portland for a Blazer game and may even hunt.
6. Your kids tend to end up working for their kids, if they work at all.