Problem with Genesis Mining is that those "Lifetime" contracts expire when it goes below their maintenance fee below 60-90 days or so.
True, I've had mine for close to 6 months currently and the increasing difficulty does mean it will go away somewhere around the 310 region.
The x11 and ethereum ones are still good for their duration with no maintenance fees though.
Which is where most of the roi will be for any buyers
http://tinypic.com/r/2uhl4iw/9^ this is with varying tests of mining start coin and auto mining doge, and etc - which shows as a flat line. I