No, do not agree to it. If they insist, ask for your deposit back and go to an honest dealer. I hope that you haven't signed anything agreeing to this worthless extra profit.
You should decline every worthless dealer add-on including but not limited to: alarms, remote starting systems, paint & fabric protection, extra warrantees, tire warranty, alloy wheel warranty, aftermarket NAV, pinstripes...The list of worthless dealer junk add-ons is endless - just say no to every one. Some of them may even invalidate the manufacturer's warranty.