We asked Sprint for an exception to their routing policy in a case that
would clearly reduce routing table size. They said no. Everyone is
free to draw their own conclusions regarding Sprint's policies and the
real motivations behind them.
I seem to remember something about Sprint having a "no exceptions" policy
on their prefix filters. I think Sean said something once about the
lawyers requiring that.
Then again I don't work for Sprint and don't know anyone who does so I
could be completly off base.