from back when I was a beginning teacher making next to nothing, I worked part time at a Goodyear store, since I grew up working on cars it was an easy above min. wage job.
that is why everyone brags about how much smoother it is with beads or centramatics,,,,,,,,,,, they both balance the entire wheel unitYou know that is a good point as I spin the rotors on my lathe to machine the ends and some do shake a bit. Not enough to notice but as you say not 100%
to me that all depends, in some things yes and in some things noIt is all about the price. Higher price must produce higher performance !