<blockquote>The problem is that the NFL should never have been considered a trade association in the first place. Love or hate the lobbying they do in Washington, trade groups are supposed to work for the benefit of entire industries, and be open to any business in that industry that would like to join. If you own a butter-making factory, then by God, you can pay dues and become a member of the American Butter Institute. The NFL, in contrast, operates a legally sanctioned sports cartel. It’s not in the league’s interest to let in more teams, because that could hurt the value of existing franchises.</blockquote>
via <a href="http://www.slate.com/articles/business/moneybox/2014/09/the_nfl_should_lose_its_tax_exempt_status_the_league_is_not_a_nonprofit.html">The NFL should lose its tax-exempt status: The league is not a “nonprofit.”</a>.