Kanye West's worth now x2 of business moguls, Jay Z and Diddy's worth put together

How did this even happen? Kanye West is now the richest black man in the US with a net worth or $6.6b, he is miles ahead of other rappers.

Hip Hop All Day puts the list thus;

$6.6b - Kanye West

$1.4b - Jay Z

$1.0b - Diddy

$820m - Dr Dre

$230m - Eminem

$200m - Master P

$180m - Drake

$160m - Ice Cube

$150m - Pharrell

$150m - Snoop Dogg