I strongly doubt Austrians voted this way because of a "cost-benefit analysis".
Why not ? Mostly old people voted (for it) and they benefit from the civil service system.
And they also think a professional army would be more expensive than the draft system and that without the civil servants the ambulance would take up to 30 minutes instead of the now guaranteed 8 minutes to every home.
Possible.
I think emotion and fear played a much bigger role than any objective calculation. The ÖVP did some pretty effective propaganda.