In my experience in governance at A Highly Ranked Canadian Research University, where most top administrative posts were held by tenured professors, they tend to take the view of "well, I successfully negotiated the gauntlet of obtaining tenure through my research, if you can't do the same, tough luck."

Dean, department head and provostial positions are heavily weighted toward highly successful researchers who have effectively "retired" into administration and seem not to consider teaching to be one of the university's core functions.

It's easier to convince these people to hire another janitor @ $70k/year than to give a contract teacher a full-time job at the same salary since to them bringing non-researchers into the ranks of permanent faculty is equivalent to letting the barbarians into Rome.