I'm fascinated by these. However I simply think the price is wrong. But that doesn't mean it's not correct for the business model as is.
I wouldn't pay anyone less than $20/hr to be working in my shop. I wouldn't sell them at a loss. Also I wouldn't be opposed to normal markup, but might be willing to lower it some for volume.
My question is if the manufacturing of them is geared to sell only a few? Are they only meant to be sold to people that own the big D speakers? That's a mistake I think, personally. If they're so good I'd rather sell them at $40 a pop (+ shipping), let's say you sell a good 5,000 (maybe to distributors, which would be ok for this item). That's $110,000 at 45% going to distributors, and the cash goes up if they're direct sales (why not sell several hundred at a show, pay for the room at RMAF?). So even so, after cost to make (if it can be brought down by producing more) you've still got $88,000. Where as at $160, if you manage to sell 200 of them you've got $32,000, and $25,600 profit after being made.
Obviously I'm unaware of what these cost to make, but with the right equipment one shouldn't have any trouble pumping them out for not too much $. And obviously both profit figures are where advertising and business costs not associated direct production come from.
If they really are better than power cable upgrades, why not give the incentive to load up on them with a price that has everyone buying? There's an awful lot of people that don't buy expensive power cables. Just think, the droves of people that can only afford Salk's great SongTowers, not the gorgeous Daedalus speakers, would be happy to get their hands on something affordable that really makes a difference; but $160 is just out of their conceptually appropriate price range.
I'm not an expert in feet, I just know that at a price where a person that isn't particularly wealth, but could buy a enough for a component every paycheck, they might have a bundle of them.
Sorry if I'm wildly off from the possibility of production costs, I'm just saying it seems like you're onto something that doesn't have to be so piddly for you, and out of reach for so many.