And that's why car audio fell apart.
To an extent your right, but thats not the point. Using a thicker wire with less resistance is never going to harm your setup, only help it. Less resistance = less heat = win. For 1.50 a foot for 5, 6, 7, 8 feet is not a lot different than 1.00 a foot or whatever the cost is. If you want to be cheap, use thin wires.