Adding an extra 1ft to premium speaker cables

Absolutely not. Electricity doesn't know nor care if it's OFC or silver or any other conductor if it's the same or similar gauge wire. Objectively, you won't notice any difference.  

@gkelly you nailed it. The guy’s a 🤡 that just wants attention 

Not at all. Some may just want to know that they all have an extra cable in front of their nice cables too. 

Just making sure I've got the story straight...

No one gave you short premium speaker cables. You made that up so you could elicit predictable responses (don't do it), and then show everyone how smart you are by explaining that there are other wires inside the speaker cabinet that carry the signal to the crossover/speakers. 

Thanks. I had no idea.

wonder if that reasoning  would apply to power cords too...