I just encountered this. I was asked if I wanted 2.8 or 3.5. Didn't put it together that 2.8 was a 1/10. It was killer dope, but the 1/10 now sells for what an 1/8 used to. Really it is just a common marketing tactic used in all sorts of retail sales. I remember in the early 70's a lid started out as a little more than an ounce, then it was the same thing, then it became 3/4oz, but the price never changed. A dime,$10, was, like today however much someone wanted to put in the bag. In those days that was 1/2-1oz. Times have changed.