It's not a strange reason. The ideologues in the GOP and some Democrats restrain the Federal Government from negotiating lower rates because these politicians

It's not a strange reason. The ideologues in the GOP and some Democrats restrain the Federal Government from negotiating lower rates because these politicians fund-raise from companies that would have to lower their rates as a result of that negotiation. And some of them are just crazy nuts who actually prefer that companies soak the government (tax-payer) for every cent they can.