I know about 10 people who have gone to law school in the past 2 or 3 years and neither of them know about this board and not a single one scored higher than a 155 (most of them under 150). Granted, my friends aren't a representative sample, but it reminded me there are people who go to law school that do not prepare for the LSAT. I'm not sure of the exact stats, but I thought I read somewhere that 80% of test takers score between 140-160 and that 170 was in the 98th or 99th percentile.
I wouldn't worry about what other people are scoring. The scale is already set. Just hope to get a score that gives you a good chance to get into your target schools.