When you sell a house, both your agent and the buyer's agent get a slice of the pie. But just how big of a slice is a question snaking its way through the courts. A jury in Kansas City this week found that the National Association of Realtors and a number of real estate brokerages conspired to keep home sale commissions artificially high. Defendants, who have pledged to appeal, are on the hook to pay nearly $1.8 billion in damages to about a half-million Missouri home sellers, and that amount mi