Actually, I think Harley was questioning why Mark would sell and cater to minors (if that's what Mark's doing) since it's moving away from the direction AA went - as in - it's a bad thing.
Remember, first off, it's ILLEGAL to sell airsoft to a minor - anyone under 18 - REGARDLESS of a waiver.
Second, a minor is a minor, and according to the gov't is NOT responsible for his or her actions and/or the result of his or her actions, again, regardless of a waiver.
Therin lies the rationale for AA disallowing those under 18 (minors) to participate in AA games. Waivers hold no water for minors.
Participation in AA airsoft events and purchasing airsoft guns has NOTHING to do with maturity - it's simply a question of LAW regarding minors.