I respectfully disagree. The S3+ will have no value in 1 year. Even with just a 10% difficulty increase per step; in 365 days the S3+ would return an average yield of 0.00066 BTC per day on 9/20/15 - IF your power cost was 0. If you paid anything over $0.02 kW/hr you would be mining at a loss.

Who would buy it?  

I don't see any value there.

Strato