That's my reasoning. Let's offer them things that don't really cost us anything, such as education, or things we should provide for our own sakes anyway, such as healthcare, in return for working more than is demanded, rather than goods that actually have value to us, such as our trade goods, first.
When they don't need education or healthcare anymore, we can use the trade goods instead.
Also, if we can produce a surplus of products, we can trade with the homeland!
As such, I think we should inquire what resources that we can produce are demanded in the homeland. It's always nice to have a stack of gold to buy stuff from the homeland when we need something!
Let's make sure the natives only value the worthless pieces of paper we give them though, so they don't want to get paid in gold too..