Maintain control of the accounts you have developed relationships with. Don't lose them to competitive firms who find they can get a better return or enjoy a better relationship with other trust companies.
Create a new profit center and charge trustee fees and other fees to your clients rather than having these paid out to a third-party trust company.
Increase the size of your business and capture new assets from wealthy investors who are looking to place their assets with a firm that has full state-of-the-art services in-house.