Reasons there are probably enough to even does not print:
- If you leave your home, your Ultimaker does not working.
- In case of absence almost all the devices you disable in the household...I think that's a good Thing :-)
- Maybe you just want to have even silence, at home, in the workspace, or office.
- There are probably people who use their Ultimaker 2 for many hours as a modern lamp :-)

Sure, you still know additional reasons. In any case, with this dust-protective cover, you can give your printer a very special touch :-)