system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why it doesn't matter how much you spend on a HDMI cable, and then how some retailers end up charging so much?

I'm asking this more so I can explain to my sister who can't understand why a $1,000 would even exist if it's no better than a $20 one.

Seriously, why does this market for overpriced cables even exist? It's not like like buying an overpriced watch, no-one will ever even see the cable to see how much you spent on it?
gpt
HDMI cables are digital, so they can't *kinda* work. Either the binary data is getting through consistently or it is not; in the first case the cable works perfectly, and in the second case it doesn't work at all.