How were DIY'ers fixing cars 15 years ago ?

[Benz300]

Eventhough It's not a 'technical question', I am posting it here as it is directly related to the technology forum...

With all of the members here who are DIY'ers heavily relying upon the advice of other members, I am very curious to know how the information was being passed around 15 years ago or so when the internet forums werent so readily available and internet usage wasn't as common.
Having forums like this give us a sort of comfort level while owning an old benz, knowing there would be others to consult incase of problems.
Were the dealerships and indy shops basically generating great revenue in the absence of such forums and owners without much advice from others ?
just curious...