The meaning of ‘dangler’ originates from the word itself. It is an object that dangles or hangs off the end of another object. In a business sense, promotional danglers are the point of sales materials and signs hanging from the ceilings and shelves of stores.
Danglers are a promotional and marketing item used for advertising sales, discounts, and offers regarding products. For example, you may find danglers saying ‘20% off’ or ‘Rs. 50 discount’.
Danglers are a form of inducement. Perhaps you have heard of the idiom ‘dangling a carrot’, which is what you are doing in this case. By keeping the person dangling, you hope they will take action and buy your item.