... besides, Nitrogen allows tune-ability in race cars' tyres-and durability and reliability in air craft tyres.
We- with our sub-2 litre CNG vehicles with Chinese alloys and road spec tyres- are lucky enough that good old compressed air works just as good, sometimes even better, for us.
I have never seen a tyre that's good on the outside but eaten away on the inside because of regular air- and even if regular air were to oxidise our rims, a maintenance or replacement job should cost less than using them with Nitrogen throughout their life.
But the fact is: if our fuel stations were to offer compressed Nitrogen for insane cost, many iDSIs, iVTECs, VVTis, Euro-IIs, 660cc JDM beasts, <del>crappy</del> craby modified 95 Civics, etc would show up anyway.
It's like the case of HIDs, Iridium plugs, Hot wires... all pain, no gain... that's the bottom line.