You know, an interesting thought is that the very slabs themselves may develop markets for this type of toning and not for the expected reasons IMO: when you go a coin show in the USA, there are tables and tables (sometimes multiple hundreds of tables) and each is replete with stacks of slabs, all appearing uniform and very boring whether they contain an 100k USD bit or a 25 USD bit. So just perhaps, wild toning AT or not may break a bit of the monotony... I absolutely am not excusing it, and am not in favour of it, just musing the point.