You are happy to learn from a piano teacher on how to play piano.
You trust what they say, because youve observed them play.
Why arnt you happy to learn from a millionaire on how to make money?
Being rich is better than you even imagine it to be. As happy as you THINK youd be if you had 10,000,000? DOUBLE IT.
The idea that rich people are unhappy is NONSENSE propagated to prevent revolts of the poor.