Commissioned recruitment company recruitment, the cost will be too high?

Our general charge standard is: Department Manager above level for the 1/3 of its annual salary, Department Manager of the following levels of the annual salary of 1/4. On the surface, compared to the general recruitment, the cost seems to be relatively high. However, in-depth examination of comparative costs, the cost of hunting is not as high as the surface.
(1) we can look at the cost of corporate advertising:
Advertising recruitment cost = every advertising cost * number of times + labor cost + job loss potential loss + recruit qualified personnel and outstanding personnel between the benefits of loss
Among them, only in terms of labor costs, advertising or recruitment will be required to spend a lot of time HR personnel to carry out the collection, screening. Moreover, the flow of talent in the market is often difficult to meet the high level of enterprise personnel needs, often cause a long time job vacancies, for the company to bring immeasurable losses. In the case of not getting enough good candidates, companies have to retreat and seek second, the loss is immeasurable. After the loss of the two companies often lack a profound understanding.
(2) the executive search firm to recruit can save a lot of manpower loss and headhunters has extensive searching for the network, to recommend talent for repeated screening, assessment and background investigation, has the characteristics of high efficiency, timely and accurate, and can avoid the mistakes in people.