I think it is a damn shame. I just called them to put in my complaint about this situation. A tech by the name of "Jimmy" explaned to me that it is because since PPC phones are Windows based phones that there is the reason why it cannot use picture mail. Then he tells me to use
1234567@pm.sprint.com to send out pictures using that. They are so trying to avoid this question and making up different solutions to try and satisfy those who are upset.