A lot of the Pirates' recent fandom may have bailed after McCutcheon was dealt - as at many other clubs, many people won't pay major-league ticket prices to watch a rebuild.
OC pretty much nailed it. Even with the hot start, the Bucs are regressing to norm. I think a lot of the fans in that area are fearing another McClatchy type run. The folks in Pittsburgh remember the 20 years of below .500 baseball.