Because ETH will have the so called ice age and the mining rewards get significantly reduced until the release of Casper and the switch to proof of stake. But you can use the mining hardware (gpu rigs) to mine similar hashing algorithms like ETC and ZEC have (:
Btw I wanted to thank you for the huge upvote at my post! I really appreciate it (:
[::: ^ :::](https://steemit.com/philosophy/@shweyaungmyanmar/where-is-your-stability-thng-yae-tnyyangimm-thny-mnythny-enyaa-yawithnny
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