Walls of text convert like crazy. You aren't targeting the Big Business Corporate Dickhead Department. You're targeting someone sitting in their underwear at their computer. The wall of text serves to draw them in, confuse them, set them straight, give them an ah-ha moment, then say "there's more of this delicious feeling of mastery for only a few hundred dollars..."

Basically, zinga of marketing. Also see: 30 minute infomercials. "This towel will change your life!"