I read the article again, and I still see my points as valid.
Quick maths to show:
40x10G switch @ 1,500 GBP -> 37,5GBP /port.
I'm currently looking at about 100GBP/10G port. Granted it's about 2.5x the price, but it's a) new, b) under warrenty, c) having features actively developed, d) not going to die of old age/degrading soldering/degrading components and e) has support costs included.
Also, my power draw is about 5w/port. We cannot calculate what the actual power draw is - but on older kit, I would wager it's quite higher, which will end up costing more in the long run in a DC (Where power IS a premium).
Lastly, my docs are current, and the amount of engineer hours spent on each device is minimal (I've got many devices in my network I've never had to login to - auto provision, monitoring in place, work flawlessly - the kind of features you dont find on older kit).
So I'd respectfully ask you to re-read my original comment and try follow my logic of breaking down pricing into per-unit.
For sure I'll give you that server/computer related stuff - totally makes sense to do down that route. I'm just not convinced on the networking side.