Signal/Noise ratios are too subjective to make any sort of reliable statistic. Not only that but you'd have to take into account factors like whether noise from dedicated noise boards counts.

One thing I find intriguing about gaia's stats it the rather large, sudden jump it made in reach and rank in autumn of 2004. Is anyone familiar with what happened on that board around that time?
http://www.alexa.com/data/details/traffic_details?&range=2y&size=large&compare_sites=&y=r&url=www.gaiaonline.com
http://www.alexa.com/data/details/traffic_details?&range=2y&size=large&compare_sites=&y=t&url=www.gaiaonline.com