If 600,000 [0] people see that $150,000 ad, the advertiser has paid $4 per impression. At $1 CPM, 600k impressions is $60,000, but as you said this cost is at the lowest end. An ad that obscures your entire screen might cost as much as $8 CPM or more [1] and now buying the newspaper ad is sounding like a better deal.

[0] https://www.nytco.com/the-times-sees-circulation-growth-in-f...

[1] https://www.buysellads.com/buy/leaderboard/id/17/soldout/1/c...