True. But if you're into doing your own maintenance, then an air compressor and tools are a good investment.
Tire rotations, inflation, suspension work, etc. Hell, I even needed an impact wrench to get the bed bolts out so I could add more D-Rings.
I've have a few bolts that wouldn't come out with an impact, but most of them were damaged anyway. I have a 13gal compressor by Cambell Hausfield that works well, but not enough air for heavy tools. I picked up a 20 gal recently, but it won't run in my barn! It draws too much power so I run 180 feet of line from my basement to the barn. In the cold weather we've had here the line gets cold and the tool stops working. Those are about the only times I've have my impact not break something loose.
With that in mind though, I am planning on upgrading from a 550ft-lb to a 900ft-lb model for all those rusted trucks my buddy seems to NEED to buy.