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.
Yeah, it's purely academic at this point, but the price for the S2's were $3899 for the first batch (the $3599 price was for their second batch).
Anyway, I agree with you - the S1's were arguable a better value but it didn't stop the first batch of S2's from selling out within hours and the second batch within a few days.