DF3/11? Why different Luck maxima?

[Kromm]

Some professions get to go up to Ridiculous Luck because it suits the archetype: artificers who can make literally anything work for them (it's a natural extension of bottomless Gizmos and Serendipity); dashing, daring rogues (bards, swashbucklers, and thieves); innkeepers whom Lady Luck favors (because she always favors the house); mentalists who can manipulate probability; those favored by the gods (clerics, holy warriors, and shamans); and those who've made pacts with The Devil (demonologists, evil clerics, and unholy warriors). Everybody else can be lucky, but these guys are extra-lucky for the stated reasons.