AM likely has far more than 4 PH/s hashing right now. They've been building their farm since mid July. That 5 Ph/s is just a small slice set aside for the specific purpose of selling mining contracts.
Do you think AM self mining is bigger or smaller than KnC farm?
No idea.
Here's some info for you though. 1700 AMHash shares are equivalent to running an SP20 with electricity costs of 0.1 $/kWh, only they cost less than half the price of an SP20 and there's simply no hassle.
Do you think SP20's are terrible value given the above info? Do you think Spondoolies' are ripping off their customers by not offering competitive products?