The consipracy theoriests says it's because the industry is an "Old Boys Club" where only the personal friends of the writers and editors get their stuff reviewed (glowingly), and/or those who are willing to cough up big advertising dollars.
I'm not sure they're so far off the mark.
For me, the 'net press is so much more down-to-earth and closer to home anyway. 6Moons has reviewed two Green Mountain speakers - very accurately. Meaning, they loved them.
Paul