"why are admins slow to upgrade"
The real question is : why is it that the rule "always wait for version 1.02" is still valid ?
Because Borkzilla & Co push out "bright" ideas ideas without a clue as to what the consequences may be.
Admins, on the other hand, have to ensure that the business continues running because, if everything comes crashing to a halt, it's their ass on the line to get everything running again.
In that kind of situation, you get burned once and you've got the lesson.
Borkzilla, on the other hand, appears to never have learned any lesson.