Can even smart people fail in earning during their life?

Smart people start to over think about things and overthinking always leads to failure. A smart person will always take the hard way to do things because they start thinking big of themselves and which leads to failure they will start analyzing and go into really deep things , what about the idiot person? a lazy person will always take the shortcut to do things 

THEY EXCEPT ALOT FROM THEMSELVES 

when you are smart you start to except more things from what ever they are doing  they will always want everything perfect and sometimes they cannot get them which crash their hopes , but what's happening if you won't fulfill your wishes? people with money they dont get that happy because they always want more things even when they have everything , a normal person will always be happy what ever they have.

EVERYTHING GETS BORING FOR THEM 

Smart and rich people does have alot of ideas and they want more and more each time and they are finding more ideas to be successful its great but not focusing on one thing can still lead you to failure They have no patience. while a normal person will only focus on one thing and will achieve success in that field which is more perfect and the best way to deal with life