My point is more that at the time the s2s were announces and sold out cost per GH/s was about the same (~$600 usd for s2 plus ~ $100 for psu = $700 for 200gh/s overclocked,  so around $3500 without warranty for 1th from s1s vs $3599 for 1th of the s2).  At the time the s1s sold out they cost was closer to $2500 for 1th from the s1s,  which would make $3599 for the s2s much less desirable.