A National Football League team today is a $6.5 billion business.That is the average value of the NFL's 32 franchises, according to CNBC's Official 2024 NFL Team Valuations. Pro football teams have been a lucrative asset for owners in the most popular U.S. sports league: The returns they have seen on their initial investments dwarf the gains of traditional stocks over matching time periods.Take, for example, the Houston Texans, No. 11 on CNBC's 2024 value rankings. Back in 1999, the last...