According to the following article: "When you hire a collection agency, you essentially outsource the process of aggressively pursuing collection on overdue payments. The expertise and experience of an agency normally exceeds what you have in-house. This improves your potential of getting some or all of the amounts due. Agencies pay professionals to collect your money and use proven techniques and systems to optimize success."
Read more: http://yourbusiness.azcentral.com/advantages-collection-agency-3041.html