Not to be pedantic, roller hockey is a really stupid sport, but hypothetically speaking, if it were indeed the most popular sport I'm pretty sure even poor families would find a way to make their kids happy.
Are you serious?
This has been studied far and wide. Sports that require money to be played tend to have very, very few poor people competing at it.
I can name pages football players that come from poor backgrounds. Not New Zealand poor,, but south american shantytown poor.
Now, just to contrast, how many F1 drives do you think have similar backgrounds? Zero.
How about rally? Zero
How about skiing? Zero
How about Polo? Zero
How about sailing? Zero.
How about golf? Very, very few, and they were all "poor" in rich countries, usually starting as caddies with free access to clubs and field.
Now, look at the percentage of people from a poor background in sports that require little to no money to participate. Both Maradona and Pele come from shantytowns.
Look at 100-meter racing. Wrestling. Boxing, long-distance running.
Tons, i mean TONS of people who come from some of the poorest places on earth.
The evidence is overwhelming and clear for anyone who wants to see it.
Simplicity helps, but really money is the biggest factor.
Problem with that argument is that football was already the biggest sport before they put money on it.
Sports that require
I guarantee you, without an iota of doubt, that kids in southern Sudan would love to have an iPhone. How many do you think got one