Matt Mosley aka His Master's Voice (with apologies to Ed 'I don't report facts' Werder) speculated that Jerry wanted Dan Reeves to sell stadium tickets and that was the deal-breaker.  Here is the link - http://myespn.go.com/blogs/nfceast/0-8-18/Another-Cowboy-rides-away.html. 

Folks this is what passes for journalism now -  Reeves wouldn't identify the deal-breaker, but my gut tells me it had something to do with the new stadium. (emphasis mine). 

Now you hear that JJ wanted an 'hours clause' - Dan was surprised that in his 29 years, he was never asked to sign a contract with such stipulation.  Well, Dan I have news for you - never in your 29 years were you anything but an assistant or a coach.  You are 65 years old, away for full-time football for over 4 years and I suspect, not living in Dallas.  What did you expect - a sinecure position?  Jerry wanted you to commit to spending as much time as required and you weren't quite prepared to do that.

I say, boycott all Cowboys haters - JJT, Brian Davis, Timsters and of course Werder & Mosley