Denon 3803 No Detachable Power Cord Why?

I recently bought a 3803, to upgrade the cord I have to void my waranty, doesn't Denon want their equipment to perform it's best? I also purchaced a Denon 2200 DVD it has a detachable cord and it's half the price! Is it worth voiding my waranty to upgrade or should I just sell and buy an amp & pre/proc and be done with receivers?