The example was to show someone taking advantage of information asymmetry. You are now just arguing the analogy. Do you believe it is acceptable to take advantage of information asymmetry when getting goods or services from someone (including children)?
I don't believe it is acceptable for there to be information asymmetry in the first place. Arguing about what to do when it's there is about as fruitful as arguing about how hard you should be allowed to beat your slaves.
I don't see how one could prevent information asymmetry. With current technology, there is no way for a 10 year old to know all that a 30 year old knows.
To me it is like asking should we allow animals to kill each other. Not only can we not really stop it, even if we could it would kill any carnivores.
