think because you might end up with an agency that is not providing the services you are most interested in, and you end up wasting a lot of money. you might be forced to work with another agency that provides that service, and this means more money. the agency should clearly state the services they are going to provide and for how long. it is important to start working together knowing what to expect and what is needed.
many people assume that the bigger the agency the better the services. this is not the case because big agencies are spread too thin because they are working on many other projects at 