I used to know Porsche people who paid hundreds of dollars for wheel alignments accurate to within 0.01°. They thought it would make them faster, and their Porsche was worthy. The funny thing is, take the car off the rack, and drive it back on, and get a different reading again. Heck, just get in and out of the car on the rack, and the alignment changes.
I did a static balance on my trailer wheels.