That’s because attorneys pay for access to those services. I’m sure if you contacted Westlaw or Lexis, they’d be glad to set up a monthly service that can run hundreds of dollars, depending on what jurisdictions you’re interested in researching.
westlaw and lexis will sell to anyone. The problem WAS that westlaw has excusive publication contracts with some jurisdictions. THUS since weslaw has their patented/copyrighted key cite system and only their books were published you could not get the books any other way.
HOWEVER, there has been a move which forces westlaw to provide keycite free publication online of public documents.
You can get most via http://www.findlaw.com