Depends on the game and if there is actual justification for hard.
Like at the moment, I am working through Demon's Souls NG+4 because even the challenge of the first run through that scared average gamers off was not a serious challenge to me and the whole point of demons souls IS the challenge.
90% of games, the point is not the difficulty or challenge, So there is no real reason to amp up the difficulty. Most random games have no real reason to play for harder difficulties. Trophies and achievements are not reasons to play through hard difficulty.
Me personally, I play 90% of the games I play on easy, because there is no difference in the easy vs hard exps outside of more time invested, Hard is just pointlessly time consuming and yields no real rewards.