I think for some people it does. if that amount was enough and they didn't then want more/waste it/let it cause problems with friends and family and had loved ones to enjoy it with.
Like someone else said, you wouldn't have to worry about bills and of course, you'd be able to have all the nice things in life, not just material, but experiences, holidays, visiting other cultures, learn to fly a plane, see the northern lights, explore the jungle, as far as you want to take it. Having money can open up so many doors in life and allow you to enrich your life in ways you never dreamed of, but that's ONLY if you are that sort of person. Though not everyone chooses to have those experience and are happy with what they have or don't like travel or material things etc and are already satisfied with their lifestyle.
Others prefer material things/going out/drinking... spending and for some of them it's like trying to fill a hole that can never be filled. (you know that feeling when you bought something to cheer you up and it did, for a minute?)
Just look at the celebrities, they can get up and do so much with their lives, travel, hobbies..anything and some of them choose alcohol and drugs. Money surely didn't make them happy, and money can never fix the bad things in people's lives or the scars you walk around with everyday.
I suppose it's like saying 'would a shiny new house make you happy?' everyone would answer differently depending on how it could change their lives and what they want in the world.
I think money would make me happy because there's so much i want to experience and can't.