Twelve Dollars

That's what they're worth- if bought during the Pre-Sale. I imagine, they'll drop in value, rather quickly after Day 1 (The day they can be opened)

Because CHAOS are only worth, what the cards inside are worth. Going by the current Chaos Legion cards available- the 5 cards in a CL pack would have an average value, on the market, of $2.

I believe though, that the cards from first 1,000,000 packs opened on day one should actually fetch about 3x face value- meaning that a Rare and 4 Commons, sold on the market on Day 1 should bring in about $10, with the odd Epic/Legendary. Gold Foil card bringing the average value of an opened pack to close to $12.

Of course, every day after that- there will be 33K MORE packs on the market. That will push the average value of these cards down, slowly but surely.