Clean Sweeper requires 3 living logs and 6 dark petals to make. Not hard items to renew, but once you pick all evil flowers from your world, the only way to renew them is by haunting normal flowers. This can be a bit of a nuisance to do, and some people might not even know that 'trick'.
In multi-player wolrds, people will sometimes leave with the item in their inventory, or burn it or lose it, and making a new Clean Sweeper can be a tad frustrating.
Adding this as a drop to the Klaus sack I find would be pretty neat for helping stock up on the item. The only problem is it wouldn't really fit in the bundle system for the drop, where the bundle with varied items has items that relate to bosses.