When did Hulk ever receive an extended downtime similar to a seasonal park for maintenance, though (a semi-serious question, as I don't know too much about Universal from the opening of IOA to about '09)? And while the SeaWorld Parks B&Ms haven't received much in the way of maintenance downtime, their lackluster operations naturally mean a serious difference in cycles, which would have an effect. The majority of B&Ms are in seasonal parks that have 4-6 months of downtime each year to completely strip down and rebuild the trains (something that can make a HUGE difference, also why I believe the SW B&Ms seem to be in relatively better shape, they seem to keep trains cycling through a similar tear down style maintenance), with probably half the cycles as Hulk per year. It may be comparing B&Ms, but it's more like comparing granny smith and red delicious apples.
Yes, B&M are kind of the BMW/MB of the coaster world in their reputation (not at all unearned, by the way), but just like with car maintenance, your engine will eventually need replaced/rebuilt, no matter what, and some engines have quirks or something that can cause that to happen faster than others.