I don't need absolute perfection, but I hate the idea of buying an expensive cable, and being lied to about how good the performance is. I don't mind paying more for quality, but its hard for me to really articulate any difference between two USB cables, except by maybe their length, and how "sturdy" one might feel compared to the other.
It wouldn't do a lot to solve the issue of various low quality cables I already own, but I wouldn't mind throwing money at a cable company that doesn't lie to its customers.