It really doesn't matter why. The NFL is a government sponsored practical monopoly with a national fan base. It earns guaranteed money every year due to television contracts that amount to several billion dollars. Unlike in any other business where financial success is primarily dependent upon the quality of product or services that the it produces with respect to the competition, this dependency doesn't really apply to the NFL because the winning or losing of one team has an insignificant impact on that entire profit margin which is split evenly among teams. Even for a team as popular as the Cowboys, because although the organization has the most fans in the NFL, it also has the most haters. So it's a break even kind of thing.
This means that unlike Jerry's oil business, where there are many other competitors, how he runs the business has no effect on his bottom line. So he can suck *** or win gloriously and it won't make a huge difference on the latter. Maybe somewhat of a dent in his merchandise sales for the extremes due to sucking or kicking ***, but that variation probably still pales in comparison to the magnitude of television revenue. And as long as he can tease winning somewhat that will continue.
