Don`t get me wrong; it was. It was however planned and announced before construction. Even had some concept art (!)
Camp M/M on the other hand was thrown up whilst the rest of the park, after years of design, was almost physically finished. They had this big space called Beastly Kingdom with nothing to go in it, beastly or otherwise, so decided on a very quick fix. `Somewhere to meet the characters` they thought, not realising the characters would be all over the park lest it turn into another EPCOT Center.