The simple answer to the increase in revenue-per-equipment-dollar is pretty clear and it can be explained in three words: "Airport Express Buses".
If those buses make 16x-17x the CPM (which they do), you'll get a major upward shift in revenue-per-equipment-dollar from the new segment.
Thats one factor. Another is the cost of LCD screens, that cost seems to go down every year from what i've seen. That would also increase the revenue $ per equipment $ ratio.
Third point -- here I assume that by "gross of depreciation" he means taking depreciation into account, if that is incorrect ignore the point below --
Thirdly, talking about the efficiency ratio *gross of depreciation* is unfair. A 2 year old LCD screen will make as much revenue as a 4 year old LCD screen, yet the "asset value" on the balance sheet will be much lower due to depreciation. This alone would cause the "Equipment Efficiency Ratio" metric he caused to balloon higher as the average age of the equipment in the network increased (ie: more and more of the equipment $ was depreciated out of the equation).
The points above can easily debunk his argument in my opinion. Let me know if you disagree and why you disagree please.
I didn't raise any of these issues in the comments section of his article because i'm too lazy (chuckle) and because I did not find his argument compelling (given the points above). I guess that was hasty, so if someone believes it worthwhile your welcome to post the thoughts above as a comment on his SA article. Feel free to edit and expand on what i've said if you wish...Bedtime for me!
-Fernando