Tamarea
Uh, yes, it is opposite, 3% for Marauders and 0.3% for others. My bad proofreading, sorry.the amount of the loss of fame will be reduced to 3% of the acquired fame for non-marauders, and to 0.3% for Marauders.
Namcha
Scouts, Patrollers and Jorneymen should not have any fame requirements. It is a way how to gain fame when your actual fame is terrible.it seems that when a NPC is outside his country, he doesn't check fame.
Ulukyn
Yes, but with fames all close to -100 it will make your life pretty complicated. A marauder can leave the faction and start to win same fame than non marauders. No any problem with that.