My version, but then it´s a matter of style, yours is good. So it´s not about mistakes here, I like your writing, the following are suggestions and, of course, others will chime in and improve it further.
Money can buy entertainment/amusement but not happiness.
"never" is a lot of time, and sometimes money can buy - bring - you some comfort, and you may share it with others, and they you feel good, happy about it.
Everything that has a price tag is cheap. At the end of the day, things that money can´t buy is what is really dear to us. Those who don´t get those things (like real love, self-respect, self-confidence, love, health, real friends) etc, will feel miserable, bored or empty. No matter how monied and in control they seem to be.
I have chosen "price tag" as a way of expressing it in a more dramatic fashion, and to highlight the ephemeral character of the buying here. Remember the song Price Tag, when the sales come first and the truth comes second...?
In Portuguese "miserável" is a word laden with impact, with a very strong meaning. One that many wouldn´t want to hear, so perhaps you would consider to think "miserable" as infeliz in Portuguese. Albeit "infeliz" in some parts of the northeastern region are equally (or almost) as strong, he hee! But then it would depend on the given context.