I dropped the idea of mining since the ROI period doesn't seems palatable to me. But I like the idea of selling the rig away after 3 months to recoup losses. But who would buy?
It would be good idea , if you reached the half of your ROI and selling your Rig , you can pass your ROI instantly.
I think anyone wants to buy your RIG , but make sure you use an escrow and explain the details about your rig if you want to sell it online .
But if it is still profitable to mine, why sell the rigs. You can still make some profit if the rig does not devalue a lot.