Essentially, this is all very risky.
Yes, normally in a match you are risking ~14 discards for 4 salvage, so this seems much more profitable.
The difference is, Discard is always more damaging than salvage is positive, as discard will often break decks, where salvage rarely 'makes' decks.
This is especially so as we are 'forced' into this EC once if people use it against us. I am for minimalising risk here, or if we really want to use the EC, then only in a matchup where we feel we can afford the extra discard should we lose.
"only gamble what you can afford to lose"
Having said all that.. I do like a gamble every now and again, and it all adds to the excitement of war, so if people disagree with my analysis, i'm happy with rolling the dice...