Yeah that's all great, very nice that you had this attitude and for you this was a way to learn the value of money and realize your hobbies. Very good. But I'm sure you can see how for some families this will be the "new normal" - both parents can't afford their rent/medical/energy bills working two full time jobs, so the moment you turn 14 you have to work to help support the family. This isn't some dystopian pessimistic fantasy - this is just how life works in majority of the world already, look anywhere outside of developed world and getting kids to work is normal. It isn't about them being able to afford magic cards - it's about being able to survive.
Like others have posted already - if wages for grown ups weren't bad enough, now they will compete with actual kids who can earn less. Is that the market you want for the society around you?