can i point something out ?? almost all of us have had to put some money into our projects somewhere along the line, even just to buy a domain.
This requires buying online, and that requires at least a debit card or a live cash card. i know that until you are 16 ( or certainly in the UK ) you have to have your parents signed consent to get one of these cards, this would make the parental consent redundant, as if they have given consent for the child to buy online, and in stores, you can hardly require parental consent on each individual sale, what is more, the only full-proof way i can see of enforcing the policy you are suggesting, is to require people to sign up via credit cards, this would mean you cut out paypal -- NOT GOOD,
Im afraid this is one of the things we are stuck with, but i do think it is unfair to generalise, i know i was paying £15 a month for a good host and the age of 15, and i was running a few small projects from it, i wasnt iresponsible, and i know a lot of guys younger than that who are really clued up and wouldnt cause problems,
what you are proposing is effectively the same as only allowing seniors to buy magasines, as then vendors can charge more without fear of cutting their market,
i dont think thats gonna happen.