You can purchase $250,000 worth of Godfather bills for an additional 150 points ($1.50). Not a bad exchange rate, eh? (Sense our sarcasm?)
Let's review: you buy the Spectre once with real money, and then again with virtual money. When you realize you don't have enough virtual money, you turn around and use more real money to buy more virtual money, so you can re-buy the gun you already bought with real money. Ain't that something?
Update: To clarify, you can only purchase the $250,000 in-game currency download once ($50,000 & $100,000 downloads are also available for one-time purchase). What's most alarming is that EA removed the cheat code for money from the Xbox 360 version.