EE person here. While you do have a point your comparison is of different applications for the wires, giga vs regular. Higher speed usually requires more insulation and what not to keep it shielded and clean. Distance is also another factor. This is why high speed designs is like an art, even when laying out traces
For your regular PS3, PC playing needs 99% of the common (not do it messy crimped cables) cables will work just fine. That doesn't mean one shouldn't buy more expensive ones to ease their mind (everyone does this really) and if it's for the right video/audio set up but I don't think many here are enthusiast in the video/audio department.
I think all my cables are from monoprice now. I've been shopping and replacing them for years with no issues. They do have higher grade cables if you need them as well. Well, they are thicker