For me, BIONICLE means family.
I cannot even begin to estimate how many hours and hours I spent with my brothers collecting and replaying the stories of the various heroes and villains, creating the combiner models, and creating new characters (our Toa of time vs Voporak was a favorite ). There was no bit of lore we didn't know, we researched every book, comic, web page, movie, video, online game, we did it all together.
We've since moved out to our own households, and thus aren't able to do that as frequently, but the memories are still there, and we often discuss with ourselves what would BIONICLE be like if it had continued further? The feelings we had when it got canceled are still there, we often wonder why? But there were many years of enjoyment and bonding over these stories and characters and I will always cherish those memories.