Piper Jaffray brokers lured to other investment firms following the announced sale of its retail brokerage unit to UBS may cost their former employer a $75 million bonus, according to Dow Jones Newswires. At the time of the sale in April, UBS said it would pay the Minneapolis-based investment bank a $75 million bonus, on top of the $500 million for the 90 branches, if 90% of the brokers would stay, with the amount dropping as the percentage of brokers remaining declined. The deal provided that Piper would get nothing if the number fellow below 80% a month after client transfers are completed, expected some time this quarter. As of June 30, about 10%, or 81 of 817 stockbrokers, have left. At this point, according to DJN, analysts say it is “unrealistic” for Piper Jaffray to expect to receive the full amount.