I had a friend who doesn't speak English ask me for clarification and this is what I told her... is it right? Please tell me if it isn't!
... During Inksgiving, readers can donate ink. At the end of the event, Tapas will calculate how much "bonus ink" to return to readers. Bonus ink can only be used to unlock episodes. Readers cannot donate bonus ink to creators.
And when I was looking through the templates I noticed in the body of at least one of them there's still a reference to Spring Inksgiving, it is one of the pretty .psd ones. 