I only read the first three pages...but some restaurants use children's meals as a "loss leader"...in other words they really aren't making any money off of them. That is why some places place an age limit.
Personally, I would never pull out a card stating that I had lapband, I would be totally embarrassed to share my personal infomration like that.
Finally, most places my kids don't even eat off of the kids menu. I am not setting my kids up for obesity by feeding them the crap that most restaurants offer on the kids menu. Now, there are definitely exceptions (cracker barrel has grilled chicken and veggies, etc) but it boggles my mind when people (myself included) who are obese and have surgery/do WW or whatever else trying to lsoe weight let their small kids eat a bunch of crap???