Actually... it is not true that it is not worth getting a camera in IT show, that said... it is also not true that it is worth it to get a camera in IT show. It all depends on the warranty (local or grey), freebies (sometime in IT show, they do give out freebies that aren't junk - example would be dry cabinet), and sometime (though rarely) IT show do have fabulous discount on a camera.
In the end, it still boils down to oneself doing his/her own homework and compare street pricing of a camera to those from IT show and the gifts that they gave out. Do remember that some of the gifts are standardized throughout different shops selling that particular camera because it was given by the brand and not the shop (for example, Canon promised to give a good tripod for every 700D bought, that gift will be given to any customers buying a legit set from any shop).