Why do many suffer from insecurity and depression despite making lot of money?

Money isn't the answer to happiness. ANd sometimes the money causes more stress and creates insecurity because you aren't sure if people like you for yourself or your money.

You can't buy happiness

I really believe that some of the people who have lots of money are surprised when they find themselves depressed or feeling insecure. Having lots of money is a job in itself. It is almost like running a business because someone has to deal with all of issues that come along with having so much money. It has to be handled, organized, checked (balance), watchover, etc. And of course, we know that there are many who have money that never become very depressed, etc...Making a lot of money doesn't take away our negative feelings, low self-esteem, depression, insecurities, nor does it pay for real happiness. Having lots of money can provide a more comfortable life style, but it can't change who or how we really are deep down inside.

You can't buy honesty about your life. The issues that affect people don't have a purely material remedy. Insecurity always has some real cause, and affect relationship with the external world. Money is frequently a cause of insecurity, too.