I just read that starting April 22, Verizon will start charging a $30 upgrade fee for discounted phones. Details at
Starting April 22 Verizon Will Charge $30 Upgrade Fee When Existing Customers Buy New Phones at a Discounted Rate – Droid Life
Verizon's reason for this from the article:
This fee will help us continue to provide customers with the level of service and support they have come to expect which includes Wireless Workshops, online educational tools, and consultations with experts who provide advice and guidance on devices that are more sophisticated than ever.
I guess that makes my decision when to upgrade my DINC to a Razr Maxx easy.