Getting back to my point earlier, I never wrote whether I personally thought the Patriots cheated or not. I just don't buy the motive you are attributing to ESPN.
I think that ESPN gave that amount of coverage to Spygate because the Patriots have been an incredibly rare NFL dynasty, in an era where that is nearly impossible to achieve. When you are on top, you get more attention. Honestly, if the Phoenix Cardinals were under suspicion for the same type of situation, I doubt it would be as big a story. However, Bill Belichick is a household name. So, correct or false, a controversial story about him will get serious headlines.
Plus, this storyline was more shocking than an NBA scandal. Unfortunately, the NBA's reputation is such that too many few people have been surprised at hearing that an NBA ref was on the take.