There is no denying that having money can aid in improving the way you are living (anyone that says otherwise is delusional)... My dad used to say this line to me all the time "Money doesn't buy Happiness, but it helps!"
but It really is all about quality of life.... Look at these two extremes....... Say you are the son of a multi billionaire, but have some awful incurable disease that leaves you in constant pain and confined to the bed in a hospital.... your life would be pretty shitty, and all those billion of dollars are really of no value to you at that point.
On the flip side, you could be a middle income guy.... with bills paid, doing ok, have a decent sized house, a sweet hot wife who loves you, good kids, a decent car, good friends....etc etc...
It really is about know how to live and just building good quality of life, regardless of your situation.