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Getting Cash from Credit Card without Fees
This was actually (sort of) possible a few years ago. The US Mint, trying to encourage use of dollar coins, would sell the coins to customers for face value and no shipping. Many people did exactly what you are proposing: bought hundreds/thousands of dollars worth of coins with credit cards, reaped the rewards, deposited the coins in the bank, and paid off the credit cards. See here, for example. Yeah, they don't have that program any more.  Of course, this sort of behavior was completely predictable and painfully obvious to the credit card companies, who, as far as I know, never let users net rewards on cash advances. They're trying to make money after all, unlike the Mint, which, uh, well...