There is more to using nitrogen than marketing.
USN uses nitrogen in our aircraft.
Yes, sorry, have to agree with Gaston here. The use of pure nitrogen in some tyres is to prolong the life of the rubber by reducing the oxidation of it caused by the oxygen 21%(roughly), in air, not because of moisture, etc.
In other words to exclude oxygen, as nitrogen is more chemically inert.
The benefits of N2 in tires are multi faceted...
The physics - smaller molecular size so smaller Press fluctuation due to leaks
Also expands / contracts less w/ Temp change than air
The Chemistry - It does reduce oxidation / degredation
It is "Dry" and reduces bad affects like corrosion of steel rims
The above do not necessarily make it "better" in a lot of applications...Agree it helps in some specialized applications
Planes go through a lot greater temp fluctuations than autos / dingys
Race car tires get HOT and a half PSI makes a difference in handling...and cost is not object to get a minor benefit. They couldn't care less about oxidation - after all the tires don't even last a full race!!!
The same tire shop that tries to sell you N2 will use a water based lubricant to mount the tire putting moisture inside - counter productive
Everyone can choose whether to put N2 in car tires (or dingys) but you should try to understand the realities and just because it is better in some situations doesn't make it better for all
If you choose to use N2 just be clear about the +/- and why you are using it based on science vs anecdotal references or marketing hype.
There are no / little negatives - other than it will cost you more - question then is it worth it?
Is everyone that's using N2 in their cars also using racing oil in their engine??? Another incorrect thought - if it's good for racing it should be great for my Sunday driver - another bad assumption in my book
During a 6 day white water trip I noticed the guides were very anal about letting air out of the inflatable rafts when we stopped for the day / night and re-inflating every morning...after some discussion they said cold / cool water requires one inflation and when they pulled them up on shore in the afternoon they were concerned w/ expansion & over inflation in the sun.
We may need to think similarly when "pulling" a dink out of the water.