The average cost for displaying and ad is 0.005$. I am assuming that 30% of that goes to publisher. Would you pay 0.005*0.3 = 0.0015$ per page view? I would.
Not without a restitution possibility. I will not pay anything for domain parking or site rehashing (sedo, quorra, expertsexchange), but I would pay for e.g. stackexchange or eurekalert.