Extra work
When you bulk buy anything, you’re usually doing it to save money, but you might be doing it to cut down on the amount of packaging that individual items would bring with them. If you’re a business and ordering 500 pens, for example, you probably just need a box with 500 pens in it and nothing else.
If you’re this company, and your personalized pens arrived like this, individually wrapped, then you were probably a little annoyed. Not only do you need to spend the time unwrapping each and every one before you put it on the reception desk, but you also have to get rid of all the plastic. I would not be happy.