I really appreciate their philosophy on buying and selling resources. It is based on Matthew 10:8, "Freely ye have received, freely give." Here's what they say in their Official Position on Buying and Selling Curriculum Resources:
"We give to others out of the abundance that God gives to us. We give
without expecting anything in return. We give because it's the right thing to
do and we want to teach our children that giving to others is something to be
Sounds like a great organization to support. Hope this is helpful!