The benefit is that air leaks through the tire faster than pure nitrogen, and I believe it's slightly better in other ways. Me ; I have a small compressor in my garage and check my tires about every three months at very little cost. I bought the compressor because I change my tires. Just not worth the money to me.
I ride a little more than some, but to be honest with you ..... If I never added air to my tires I'd be just fine between tire changes.