Sorry, you're right, I made a mistake. It's actually SIX for each channel (speaker). That's because the banana-sporting wall-plates are female on both sides, so you need plugs for the inside and outside of the plate. Plus two more for the speaker itself, so 6 plugs per speaker. That's why I used plates where I can have the wires coming out of the wall instead of having to use so many connectors.

If the speakers are in-walls, then you'll save yourself a bundle by not using plugs, jacks and plates.

Also, if you're thinking about actually paying someone to patch up the drywall then you might consider just calling someone that does cable routing for a living to do the whole install. I have no idea how much that would cost, plus I believe it's pretty regional, so even if I knew the cost here it might not help you that much.