Tape can be used for a lot of other things than bandaid. Think of it:

1. markers of a certain area (used for fundamentals instead of a beanbag)
2. mark the place where a student is injured (wrist or location like shoulder)
3. you can write on tape and do an exercise with 
4. show the place where to sit for an exam (to practice)
5. explaining where/how to roll with an ukemi > find video..
6. make arrows in your dojo for a temporary seminar
7. make beautiful frames to hang your assignments up on the wall
8. fix a broken bokken temporarily (or prevent splinters to injure you)
9. cover earrings or bracelets

Can you think of even more things? Let us know.