The real problem with nitrogen is finding a place to get it. Depending on where you live, there may be places(shops) that have it, may not. You can buy tanks of it, but...what if you have a flat on the road?
I was at a drag race once on my 750A Honda years ago. When I was ready to leave, I found my rear tire flat. Most folks were already gone, but a few of the fuel teams were still there. I asked one of the crew guys if they had any way I could air me tire up, and he brought out a tank, and he told me it was nitrogen, as that's what the used on the FC tires. I just looked at him funny, since I had never heard of that at the time. He had a little fun with me, and told me I had to be careful, and not put too much in, because it would make the bike too light, and it might float off the ground.....
Had me worried there for a minute or two....
Anyway, I don't see the advantage of using nitrogen on a regular basis.....