It's not that easy to manage your own damage output this way.
1. You have to expect SoSac. But not too much, or he won't play it. So, you need to bait with at least 17/20 dmg. If you tried to rush him, it may be too late already.
2. You have to be able to survive long enough against him (he will certainly poison you). And now that you are trying to reduce your dmg output, the game will last longer.
3. You must have modulable creatures (graboid, steam machine), or use your own CC on your creatures (squid, otyugh, warden, etc), or play weird cards in weird ways (antimatter, SoP, etc).
I don't really see this as a good counter. It's too hard to build, and nothing forces your opponent to play his SoSac if you are too low in dmg.
I play SoSac, and I'm not scared by this at all.