After just returning from the World, I can say that I thought the TS places we chose had very poor quality food. Most places gave you a special menu to order from with limited choices. After a week, I was really sick of sauteed green bean, mashed potatoes and carrots. Everything on the menus could be purchased in bulk so I am sure that Disney is still making mega-bucks, otherwise they would not be offering this plan! And, if they were really worried about people abusing the plan, they should have designed it to differentiate between child and adult credits. DH and I usually shared a CS because we weren't terribly hungry (after downing water all day!) and our DD and DS would each get one CS. Some days, my DK's shared but rarely. On our last day, we had 9 CS left. We all ate breakfast at Capt. Cooks then went back on the way to the car and got 3 flatbreads and 2 sandwiches to go. I wasn't going to leave any food uneated. We just weren't hungry during the day between breakfast and dinner. It works out differently for everyone, but I don't think that people sit down and plan out how they can screw Disney on the DDP.
I guess it takes all types... I havent been to WDW in quite a long time, but I remember having lunch at the CP in MK, Dinners at the GG in EPCOT, and CMs at the CR. Never once was I disappointed in the food that was served. I happen to enjoy buffets because they allow me and my family to eat whatever we choose, in whatever amounts we deem appropriate. I tend to eat more beef and chicken than I'd be served as a traditional entree, and also eat more salad. But little else, untill I get to dessert 
