I know most will disagree with what I will say but that's what I found through out my experiences.

If there's no money tag associate with something (downtime, results, etc) then it's none existent for management.

Therefore each time we had plan something, we translated it into dollar cost or man hour (which is then translated into dollar cost by management). Still an approximate but it got the attention it deserved only because money is involved, they have something "tangible" to look at.

no money -> no worry (don't care)

some money -> some worry (will care to some extent)