Stupid question about tires

OK - so a point of view from the other side. I have had 3 sets of tires on the same vehicle, same basic tire as well, some changes over the years, but same tire. First set, new with vehicle, a friend recommended nitrogen due to the low profile tires. A nearby place removed the air and replaced with nitrogen, their pump system did something that seemed like it was removing and refilling in a step process, but assuming you can't get all the air out. So, my experience, the tires held up great, 80K miles, stayed within a few pounds regardless of hot and cold weather. Next set, different tire shop (discount) regular air. Tires only lasted 40K miles, had issues with one that kept losing air on a regular basis, no one from 3 different shops could find anything wrong with the tire, but I had to fill regularly. Now, 3rd set, same brand, but this time Costco. Costco uses nitrogen. Tires have been on for over a year, haven't had a single tire issue, tire pressure stays within a couple pounds. So, yes, I think nitrogen is a good thing, but also don't search it out and have never paid extra for it. But, there are shops that have nitrogen compressors, like Costco.

Just my 2 cents from experience, fact not fiction.