Some random bits of data...
The commodity price of silver is running right around $400/lb. right now ($27/troy ounce), and that's just raw silver. Drawing it out into wire that thin can't be cheap.
A single coil uses roughly a quarter mile of 42ga. - 43ga.wire. I don't know what that weighs.
A typical built-up single coil weighs roughly .10 lbs, but that includes pole pieces, coil form, connecting wire, etc.
The electrical resistance of copper is 16.78 nΩ (millionths of an ohm) per meter
The electrical resistance of silver is 15.87 nΩ per meter
Given the same gauge wire, it's unlikely there's any difference in labor cost to make a copper vs. silver wound coil, although silver may be easier due to higher tensile strength (less breaks)
What does all this mean? I don't know, other than I doubt they intended to make a really expensive pickup - it just ended up that way due to raw materials cost. They already have all the talent and machinery to do it, so no new investment there. They could have just contracted somebody to make some ultra-thin silver wire, then ran it through a typical pickup fab process to see what came out. Guaranteed to come out sounding at least a little different, if not a lot, so after that you just let the marketing weenies loose with a bucket full of adjectives and a thesaurus to write some ad copy, mark up the price to somewhere in the stratosphere to keep the bag ladies out, and POOF! You've got a lust-inducing product nobody else has.
For all we know, the thing sounds like shit. Not likely, but possible. And who's to dispute it? It's not like everybody on the Harmony Central forums is going to buy a set to play with. Then, if they did, do you suppose they'd say anything bad about the things? Unlikely, after dropping that kind of change on the idea.