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I had a set of tires filled with nitrogen a few years ago on an old car. The tires went at least 2 years without needing pressure adjustment. Nitrogen is drier than most air fill, in addition to being a mostly larger and more uniform molecule. Moisture in the air really affects how the pressure responds to changes in temperature. When needed, you can top off the nitrogen filled tire with normal air, as the small amount will not affect it that much, as long as the air is reasonably dry at the time. I also really like nitrogen fill for tires that see track use, as they seem to keep more consistent pressure as the tires heat up.
What price were they asking you to pay for nitrogen fill? I just had a new set of snow tires mounted and had them filled with nitrogen for $5 per tire. I felt that it was worth it based on my past experience.
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My cars always dress formally. They all wear black tires.
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