With a little tax planning -- or even divorce -- wealthy Americans can easily bilk Obamacare out of tens of thousands of dollars in taxpayer subsidies to cover their insurance costs, according to a “how-to” written by a well-known financial advisor. David John Marotta, of Marotta Wealth Management in Charlottesville, Va., said just a few lifestyle changes would enable a family that owns a business providing income of $140,000 to legally win enough subsidies to cover all but $600 of a $10,825 Obamacare silver plan policy. “In trying to make Obamacare a middle-class entitlement, the legislation encourages even wealthy people...