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Best thing about expensive speaker cable is the way it looks :)
I'm sure there's a market for a plastic shrouding that looks like really expensive speaker cable that can be cut to length and clamped around any normal cable (including figure-8 bell wire) to make it look like you've spent loads of dosh.
Then, because hi-fi stuff is so meta, you could probably charge a fortune for such shrouding with claims of it being oxygen free plastic, balanced/bi-directional and providing other magic 'neutral-shielding' type properties.
Resistance of the wire creating different loading on the amp, probably negligible. Best thing about expensive speaker cable is the way it looks :)