I have now mined a number of coins with Genesis Mining and they have ALL gone the same way - they start off ok and then little by little they reduce until there is hardly any daily payout.
Has this happened to anyone else?
I'm pretty sure this has happened to everyone else. =P Because difficulty trends upwards over time, your contracts will pay out less and less until they are finally cancelled due to the fees exceeding the payout.
It's always a good idea to evaluate whether you're likely to ROI before the contract is cancelled, prior to any (further) investment. (I was never any good at that so I gave up, haha.)