I’m assuming the “highly scientific” part is a joke.This.
The size of the market is not like border wall around any given city. It is also the surrounding area, and largely the state and general region. You better believe in Texas alone there are far more Spurs fans than there are Jazz fans in all of Utah/Wyoming/Idaho/Montana combined. Not to mention surrounding states and just the general popularity of the franchise around the country. The Spurs are undoubtedly more popular in general, thereby entertaining a much larger fan-base, than the Jazz, and therefore, worth more to the NBA in general.
This highly highly scientific study bears this out:
Basketball is one of the most popular sports in the United States, that's why we decided to make a ranking of the NBA teams with most fans. Who's in first place?bolavip.com