Lets be honest... Charmin/Cushelle are bog roll. I really don't think most people care whether its a premium product or not, and I suspect all the manufacturer cares about is how much they can shift. How many bog roll brands can you remember from your childhood which are still around? Only Andrex springs to mind and they're not exactly a premium product... and not all brands are destined to last for many lifetimes, some will be sacrificed part of a tactical decision to maximise profits in the short term, which might seem weird with a longer term view.
gbb reminds me that quite some years ago I spent a day (only a day!) working in a salad packing plant. During that day I had several jobs, including acting as a conveyor belt to replace a mechanical one which had broken down, but I digress. The same salad was packed into "premium" branded bags, into "high end" high street bags, into supermarket bags and into budget bags. It was all the same stuff, all picked, mixed and packed by the same people.