Citing the chart from Legacy Audio's loudspeaker user manuals, the per foot capacitance of a 12 guage interconnect is 24pF per foot. In engineer Bill Dudleston's words, "Approximately 300 feet of 12 guage would be required to establish a corner frequency of 20 kHz with an 8 ohm loudspeaker." If you're wiring St. Patrick's Cathedral for sound, you have a point about interconnect capacitance, but not in any home installation likely to exist. Yes, if the wiper is full out, the resistance of the volume control is zero. You always going to listen that way?