I think kids are fairly similar. It's just really the technology. Like, you won't find kids in the 60s, or anyone for that matter, having mobile phones, texting, watching YouTube, and being absorbed in their technology.
The successful producer of an article sells it for more than it cost him to make, and that's his profit. But the customer buys it only because it is worth more to him than he pays for it, and that's his profit. No one can long make a profit producing anything unless the customer makes a profit using it.