This shows that you dont have kids, or dont pay much attention what they do during free time. You see the situation from adults point of view, but kids (I mean like real kids, not teenagers) dont care much about money. They have parents to solve all that "money moments". So when the kids see money on the table, first they get excited if there is a lot, but often quickly lose interest to it. You know, the kids rarely measure things different than adults. They rarely use "money" to measure things. When they see something, it is big, small, shiny, tasty, red, heavy and etc. They dont measure things as "that cost 9.99", "this is 100 bucks", "wow that cost like 3 my monthly salaries", "this car cost a million".
Regards your phrase that I have bolded. When I was a kid I bet 3 chewing gums that I can swim the pool faster than my friend. From your point of view, I with this bet I did something bad and I did not deserve to even place that bet. But, I believe, when you was a kid, you did similar bets either.