Instant Millions Can't Halt Winners' Grim Slide By JAMES DAO Published: December 5, 2005 CORBIN, Ky., Nov. 30 - For Mack W. Metcalf and his estranged second wife, Virginia G. Merida, sharing a $34 million lottery jackpot in 2000 meant escaping poverty at breakneck speed. Years of blue-collar struggle and ramshackle apartment life gave way almost overnight to limitless leisure, big houses and lavish toys. Mr. Metcalf bought a Mount Vernon-like estate in southern Kentucky, stocking it with horses and vintage cars. Ms. Merida bought a Mercedes-Benz and a modernistic mansion overlooking the Ohio River, surrounding herself with stray cats....