50 Cent (that would be Fiddy Cent if you're hip to the hip-hop scene) is not immune to market pressures. If you've wondered whether a person with a price for a name would be influenced by inflation or deflation, the answer is yes. He's lowered the asking price for the house he's trying to sell. See 50 Cent Shaves $ 4 Million Off Farmington Property. Via NPR Planet Money.
Whether he'll lower the value expressed in his moniker isn't known. But he very loudly declined to raise it for Taco Bell, so the odds are that he won't, at least not for a fast food taco.