Pass that bag of popcorn here while I make another.

It is actually understandable that these Chinese companies don't make or sell spare parts because the planes are so inexpensive.

Wreck a wing? Buy an new plane and save what's left from the first one as spare parts for the second!

One reason the plane is so inexpensive, is because the production of the plane is designed around producing whole kits/planes. That lowers production costs. Thus, lowering the customers cost to purchase the plane.

It's too expensive to run production for parts. Add to that packaging for the spare parts.

So, in the long run, it makes more sense to operate in a manner of whole kits, while it benefits the customer in more ways than one. Otherwise, you will be paying more than half the cost of the plane just for the wing ... And that doesn't make sense to me.