This is... not correct at all. Have you ever taken a digital signal processing course?
It's really difficult for a digital signal to be degraded without being completely unwatchable. You'll either get the same picture quality or no picture at all.
See, the crazy thing about 1's and 0's is that when one bit goes bad, it's impossible to do the decryption, unlike in analog where the picture will just look fuzzy. Therefore, when a cable gets the stamp of approval and is labeled HDMI-compatible, it is guaranteed to not drop packets above a certain threshold.
In conclusion, pretty much all HDMI cables are exactly the same - you can go and buy your 100 dollar cables, while I'll buy my 8 dollar ones.
You may have a case for delivering a signal through a computer server room which is buzzing with electricity compared to wiring up an apartment. However, there's no need for a better cable in your example. Sorry!