That is not the key to happiness. That sounds like the Filthful and Disgraceful Slavebugger is scamming people again. Give them all your time and money, expect nothing, and you will be happy. Well, the truth is they will be happy, because they will have usurped everything from you.
The real key to happiness is to give more and expect more. And that doesn't mean giving your money to some bogus charity, either. It means giving society more value. Creating value for society, something that people will think of as necessities and wonder how they ever did without it 10 years later, is what leads to more happiness. And you expect more, since you get paid for your value creation with money and with fame. And not a single penny goes to the Worldwide Pedophile Defense Fund.
What makes them think people can be happy in a Dark Ages?