200 M ohm resistor ?

I notic a 200M ohm resistor was connected to the axia of the rubber platen of the high speed printer. I belive the purpose of the resistor is to drain the static charge create by the platen when paper are feed in high speed. I am curious why a 200M ohm resistor was selected instead of a zero ohm resistor. the 200M ohm can actually act as a insulator,which is very poor in electrical conduction. Does any person know the reason ? thank for any explaination.