At least initially, competition among Europeans ensured that Native American leaders could negotiate reasonable prices for their goods. Furthermore, their important role in the lucrative fur trade protected them for a time from the kind of extermination, enslavement, or displacement that was the fate of native peoples in Portuguese Brazil.
I think it's crazy to think that even this long ago Native Americans were seen more as a resource then as people, as their value in the fur trade was seen as the main reason that they were not exterminated or enslaved like other native people.