True, but with my setup you could easily flip the CPU coolers and make half of your money back.  With the S7s being a fully contained unit, it will be hard to get much for them once the 'S8' comes out.  With this you really only have ~$600 invested in actual mining boards (which you should be able to ROI in no time), everything else at least has a secondary market.  If you have access to cheap power, this is a pretty nice setup actually.