In my mind, the aftermath of getting caught cheating is too detrimental to ever make it worth it. Reasonable people can debate whether or not it made a difference or how much of a difference the cheating made. In the NFL, however, the difference between winning and losing is so small that the cheating will always leave a doubt. It's impossible to say that videotaping and deflating balls didn't make an impact. It's also reasonable to infer the possibility that the Pats have been doing other things that are cheating that could have had an impact.
Once you get to that place, it's easy to doubt the validity of those titles, even if nothing can be proved. In my mind, that makes winning a title less appealing that losing one.