You could go with a heavy gauge steel rollup door rather than the standard aluminum. Very heavy though. You would also have to paint this every few years or you could opt for a powdercoated finish which adds more costs.
Steel doors are generally classified as "fire doors" and can get expensive. Your point of diminishing returns starts to kick in with these type doors.
Scoby
“Laws that forbid the carrying of arms disarm only those who are neither inclined nor determined to commit crimes. Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man.” –Thomas Jefferson, quoting 18th century criminologist Cesare Beccaria in “On Crimes and Punishment”, 1764
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