When the products are sold, a small percentage is deducted for the administrative costs of the centre and the rest of the proceeds are paid to the residents responsible for the products.
These works of art are relatively inexpensive and considering the effort and skill that went into making them, definitely worth it. I bought these wooden sticks that serve as bookmarks for 20 baht each. Just look at the intricate work that went into making the dolls attached to the sticks.