They are finding and locating buyers on behalf of the producer, as well as help promote the product
Intermediaries are specialists in selling, so the producer may be able to reach a wider audience
Manufacturers achieve greater sales by using intermediaries
The producer may not have the expertise or resources necessary to sell directly to the public
The intermediary may be able to provide more efficient distribution logistics. (transporting to various points of sale)
Overall distribution costs may be lower using an intermediary that if the business undertook distribution itself, even with the intermediary's commission.