If a situation is being manipulated to their disadvantage or they receive enough complaints, they will eventually change it.
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Exactly, but the ones who get to decide when a program isn't working as they wanted it to, is Disney. They may not see the child's AP use as any type of manipulating..and may just be happy to be filling rooms. Disney as in official Disney. To CM's, it's a job. They don't know everything about everything. You may ask if you can use a child's AP and be told no, but unless it comes from an official guest services email, the answer could mean nothing. I would be very surprised if many people are buying AP's just for their children, to get that discount. The discount isn't that much more than the "regular people" codes for the values, and a lot of people, believe it or not that I have talked to, don't even know or care about the AP's, as they only come once every few years. A lot of people have never even heard that there are codes.
By the way, several years ago, I was told by a CM in one of the parks, that I could not make same day ressie's at Chef Mickey's. I have since found out that isn't true, and we missed what could have been a fun time. I'm sure many of us have been told incorrect things. I know I've written to guest services many times, based on stuf I've read here. Someone brought up pool hopping. Going back to "it's all in how you ask", I certainly know the pool hopping policy. However, I did email and ask last year if it would be possible to ask at a hotel, if while waiting for someone to come off the pirate trip, if another child could swim. The answer was the official answer, followed by a note, that I could also ask at the hotel, to see if that was possible that day. I have also found that the "official" email that they send you, doesn't always go with what the person who wrote the email says when doing their follow up phone call.
In any instance what will be will be, I would rather spend my time enjoying the vacation, and the prep, and not policing anyone else. I have had a lot of fun with my "pool hopping" pictures here, and find it's easier to just be lighthearted if you believe someone is doing something against the "official" rules. Disney can take care of themselves.