Could it be due to the lack of craft mesh? The wheel does have grips on the inside of it, so there isn't a problem with them being unable to use it. They just don't, or either don't use it while I'm awake (hopefully).
Could they be using it late at night? Is there anything I can do to make it more enticing?

5 PPs: Koa, Moja, Siam, Chella, and Ozark.