Investing in mining(POW based) as on date is bullshit concept and people must listen to those omen where the dynamics to going to shift towards POS and POS based mining is the future.
PoS is next cryptographic revolution in terms of mining development. And the reason it was not adpoted with Bitcoin early in 2009 was the fact that at that time no decentralized currency was there and when you are innovating something decentralized then how can you adopt the mining based on a centralized currency like paypal, debit card, visa etc.and might be for that reason Bitcoin have had to adopt the POW system of mining.
But now we can...... because we are already in the era of cryptocurrency and this generation is crypto generation, so we have ample resources to go for "proof of stake" mining.
And that is the reason why I love STEEM, BTS and EOS which are third generation cryptocurrency.
Thank you.