Kids in Denver and six other counties in the metro area could soon benefit from billionaire Rob Walton’s purchase of the Denver Broncos. The Metropolitan Football Stadium District, the division of the state government tasked with building and protecting taxpayers’ investment in the Broncos’ publicly owned field, will soon be distributing more than $41 million of the $4.65 billion Walton and his ownership group paid for the team, Matt Sugar, the district’s director of stadium affairs, confirmed Thursday. The origins of that multi-million-dollar tax windfall date back to 1998.