Here the main fact is mining reward value it decreases dramatically by time. In January 2018 if you have a Ethereum mining rig with a hash rate of 180 mhash the Eth reward was 8 Eth but in January 2019 the reward will decrease to about 4 -5 Eth only and the electricity bill is also a killer fact.
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Yeah, also eth price going down isn't helping either. Thanks for your comment!