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As an alternative, you can select them all and reduce the bid price to 5 cents, that way the traffic you get (if any) will be very cost effective.
Or, you could just let the account wind down money wise.
The program is not designed to be switched on and off, and frankly I agree with it. You don't want occasional advertisers coming in and dominating the listings when it suits them and for the 24/7 advertisers to be penalised by less traffic.