Wall Street banks are reaping outsized profits by trading with the Federal Reserve, raising questions about whether the central bank is driving hard enough bargains in its dealings with private sector counterparties, officials and industry executives say….The resulting profits represent a relatively hidden form of support for banks, and Wall Street has geared up to take advantage.Barclays, for example, e-mails clients with news on the Fed’s balance sheet, detailing the share of the market in particular securities held by the Fed. “You can make big money trading with the government,” said an executive at one leading investment management firm. “The government is a huge buyer and seller and Wall Street has all the pricing power.”A former official of the US Treasury and the Fed said the situation had reached the point that “everyone games them. Their transparency hurts them. Everyone picks their pocket.”