Why? I judged high-level roller skating competitions with that system (well, basically 10.0). There were often 30-40 skaters. I simply wrote down my scores based on the quality of the performance, regardless of whether or not it was the first skater, one in the middle, or the last skater. Except in the case of maybe the top three skaters, I did not need to try and calculate how each skater was going to be ranked. The scores were the important thing, the rankings were just what they were. It was never up to me to figure out the ordinal placements. They were simply determined by my scores. How is that so different?