We are really curious about this too....what would the optimum price per GH/s be for a used mining rig these days? $10 a GH/s seems to be the the lowest I've seen for some of the higher capacity rigs.....would that really turn any kind of substantial profit or would it be completely obsolete after 2-3 months?
thats terrible. You should be able to find an antminer used OR new for about $4-6/GH ($700-1200)