Point out that using an AMC does not release them of certain liabilities for Appraisals, Fees, Quality and disclosures that are mandated by the GSEs. It is less risky for them to control the process then to use an AMC, because when using the AMC they still have all their previous liabilities plus any new liabilities the AMCs create for them because it is the lender that is ultimately responsible. You might point out the several major lawsuites against AMCs that are out there.
I would also point out that as of October 19, 2010 HVCC will be sunset and have no force or effect according to the Frank/Dodd Financial Reform Law, HR 4173
http://www.gpo.gov/fdsys/pkg/BILLS-111hr4173ENR/pdf/BILLS-111hr4173ENR.pdf
And, I would point out that this same law calls for a total reworking of the GSEs, which if you watch the financial news, almost nightly now there are panel of experts discussing how to rework the GSEs. All things in lending will be changing within the comming year, therefore they will have the benefit of having greater oversight and control of their process by doing it themselves, which will make it easier to adapt as things change instead of having to honor contracts for services that then become obsolute under new laws.
I would also point out it would be better for them to reduce their liability risks to have control of their own appraiser selection and panel because the new Consumer Finance Protection Bureau will require new reports and more detailed demographics for their borrowers and venders and that the new bureau will be comprised of parts of existing government entites such as the OTS, the FDIC, and others.
It might be benefiticial for you to read through pages 661 through 664 of the bill at the above link as these changes will affect the bank, and they will be impressed you can see something from their point of view with some knowledge, and that you have researched some of their problems.
With any type of sales, you have to gain their trust by seeing and understanding their problems then show them how you can help. Oh and the law, by the way, has mandatory reporting of bad appraisals as a part of it, so you could point out that the bank can stop the garbage appraisals faster and with less expense on their own, than if they used an AMC.