Heh, I can see it now, a haven world the humans turned into a massive farm planet with tons of crops and lots of well-kept and cared for farm animals. Heh, and that "small amount"?
"We just want around 2% of the total harvest to feed the needy in return for this, if that's ok?"
"Only 2%? Hell take 5%!"
"You sure? That's a lot."
"It's only 5% of the total harvest, not as much as you think"
And the Gyiiks end up having to call in a huge number of ships to help haul away that 5%, which is enough to feed several planets worth of hungry. :-)
The Humans definitely do not mind. Totally worth it.