When it comes to personal indulgences, there are signs that the wallets are beginning to open up. Traders and executives say that jobs seem much more secure. Businesses whose fortunes ebb and flow with the financial markets are thriving again. “Wall Street is back spending as much if not more than before,” said the New York cosmetic surgeon Dr. Francesca J. Fusco, whose business is booming again after a difficult few years. Christie’s auction house says investors from the financial world who fell out of the bidding market during the 2008 credit crisis are “pouring” back in.