I'd love to know how much money is put into bball programs across the US. To pay for coaches, shoes, court time, travel, etc. for leagues across all ages is pretty insane.
For football, maybe coaching and extra development doesn't matter as much at a young age? I'd equate football in the US to hockey in Canada in terms of popularity and such. In Canada, you typically just get volunteer coaches at the minor league programs. Some are great, others are s***. I'm yet to see any kid simply play 2-3 times a week at minor league hockey who goes on to have significant success. For the vast majority it often requires $$$ for extra ice time, private/semi-private lessons, etc. and eventually a move to an expensive AAA travel team.
I'd even suggest that to even make rep team at the age of 8 through 10 that you typically need to pump some extra money out to get them on the ice more and to give them extra opportunities. Otherwise they're destine for the local league program, which are mostly full of kids who just play for fun - no focus, no effort, etc.
Edit - Hurl kind of beat me to the punch...kids simply can't start playing baseball or hockey at age 13 and go on to great success.