Poor people do not think money fix sadness lol. They just think it fixes a lot of the things that does make you sad, like not being able to pay rent, afford a meal for upper family, buy christmas presents for your kids, pay to get your car fixed. etc.
I've been poor for a long time. Trust me, daydreaming about money fixing all the problems is one of the biggest if not the biggest time killer/entertainment.
What I noticed climbing the ladder is that some people are happy and some people are sad independently of the income. And if much it seems that I met happier people in general when I was poor than now. I was happy in my poorest time and I'm still happy, which helps me see through it without the constraints of money.