I tried this just after PvP re-opened last year. At first, my "Global" ranking score was reduced by about a third, my "Personal" ranking was reset from 100,000 to zero, and I was able to climb to 100,000 again. The next month INNO closed this loophole. My Global ranking still went down but my Personal ranking remained at 100,000. It was fun while it lasted but INNO closed the door quickly.