(http://i53.tinypic.com/2janfrd.jpg)
Compuserve, charging $11 per hour, had "more than 250,000 subscribers".
The Source, charging $8 per hour, was popular for its conferencing system "parti".
Delphi, charging $6 per hour had a loyal but small (less than 10,000 users) following.
BIX, $9 per hour, grew from a magazine. Notable quote: "This is the computer industry as it used to be: people sharing ideas and solutions without the greed and grit with associated with today's corporate driven, litigation-laced, industry" (remember this was written 23 years ago).
From the Whole Earth Catalogue "Signal - Communication tools for the Information Age" (http://www.wholeearth.com/issue-electronic-edition.php?iss=1300)