There are people with black money who keeps it hidden and this is important to discover that the money is not black and someone isn't running from taxes.
The biggest amount will be reported while the other are not. People tries to hide their identity it is because they just follow their own rules. If we are talking about black money of course their is and it really exist. The thing is every business do we have should have taxes for us to be covered in the government. It is also an investment other prefers to have an identification.