Quark could supply every Mac in my building with free Q8 and I would still rather open CS4 any day of the week.
Are we all not forgetting the past five years of hell with Quark files? I can open my suite and edit every file located within my INDD file on the spot.
Throw in Separations Preview (which God himself must have created) and, well, you have a nice application suite.
For 20 years I have just taken it as a cost of doing business to upgrade within 30 days of a new Adobe and or Quark program.
I bought Q8 because one guy bought it first week. Other than that one time, I have not had to use it until January of this year. We open Q7 at the beginning of the day and double click to open from there. No Q8 needed and therefor no Q8 used.