Stef Syzmanski, in Sunday's Observer:
What attracts major-league moguls to the Premier League is its popularity, particularly in broadcast markets - the current contracts, including domestic and overseas rights, are worth about £2.7bn over three years, or £45m per club per year. By contrast, the NFL, the world's richest sports league, has broadcast contracts worth $3.1bn per season, or $97m per franchise. At today's exchange rates, these are roughly equivalent sums per club. Even better, the Premier League is enjoying rapid growth from overseas sales, something the NFL is unlikely to do. The Premier League might soon even challenge the NFL's pre-eminence in revenue.
There is much, much more to the story, so do go and read it.