You don't need to own a time slot completely. You could still split impressions based on a time slot, eg. you pay for 80% of the impression in a slot and I pay

You don't need to own a time slot completely. You could still split impressions based on a time slot, eg. you pay for 80% of the impression in a slot and I pay for 20%. You can still target "all sports fans form 10am to 2pm" or something as well. This would still remove the incentive for fake clicks.