Producer Scott Stortch blew 30 million on blow, lost his Bugatti and was buying cars for Lil Kim and other females, and then the cars were repoed, for nonpayment...
Though later to be proven untrue, Layne Staley was rumored to be found dead only after he was no longer withdrawing 3k per day (or some outrageous amount) out of his bank account to cop heroin.
Like in life, the more you make, the more you'll spend on your lifestyle. Guys making 30k/year will only spend a small amount in relation to their income on their habit. But guys that make 20mill/year will spend more money in one day than the smaller guy makes in a paycheck to support their habit.