平淡无奇的过一生也是一种幸福。
Poor people are happier because they have less wants, desires, and are happy with what little they have.
Once you have more money, you end up wanting more. Sometimes not because of greed, but because you want to test your limit, and see what you can achieve in your lifetime.
Even if you can maintain your original intention, having more wealth will naturally attract unwanted people who are looking to leech on you or make money off you.
Long explanation of EDMW number one chiobu's favourite statement.
@cosmothecat