I don't think this statistics are that alarming.. you are essentially only tracking those players that are multitabling... since given the number of tables running it's difficult to get huge sample sizes from any one opponent unless you are extracting that data from multiple tables. And it's more common to see a multitaber play a nitter style... So although I agree that 100NL is a rock garden... I think your statement actually is verifing that those that multitable 100NL tend to be very rocky... not that everyone is a rock.
Your sample size is obviously much larger than mine.. but mine shows a similar trend the you reported for those persons from whom I have over 1000 hands listed..
11.8/6.3
9.14/4.7
16.1/3.8
19.5/5.2
11.9/8.9
11.6/1.1
Apparently I need to play more hands....