Steem power is good investment for future..like other currencies if the difficulties increases than the value of the crypto become strong
As steemit Algorithm improves and more the people joins the steemit and they will have to buy steempower to compete with others in efficient way ..the demand increases and the steem value surges..
Remember that the value of steem and steem dollor is different...steem dollar is Align with US $
Simply we say that both factors drive the steem value