Because a registration service is an independent contractor, you don't have to worry about personnel costs such as payroll taxes, workers compensation, health benefits, vacation time, sick leave, hiring and training costs, and sacrificing office space for processing DMV papers.
If you hire an employee to process your DMV work and that employee commits fraud or even negligence, your are financially liable. By using a licensed bonded registration service. This indemnifies you from action by the customer up to $25,000, and provides you with the option of filing your own claim against the bond.
Keeps your Dealer License in good standing with DMV.
The last thing you need is a customer complaint to a DMV Inspector because they haven't received their registration. Using a registration service frees your time and energy to do what you're good at and what pays your bills: selling cars.