Paybuyer will always tell you how much advertisers are paying for your attention, unlike Google and other ad media, who keep that information secret from their audience.

Their secrecy has worked: most users are clueless. We asked two hundred people to guess how much Google collects for a click under "auto insurance." ~25% said 5 cents or less, ~66% said 25 cents or less. Over 90% were surprised to learn it's >$50., Oct. 2000.
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In the beginning, click prices were shown.

Auction-based, pay-per-click search advertising, the Google Ads model, was actually developed by a different company called in 1998. started out displaying prices with each link:

"So [Bill Gross] launched a company with exclusively paid search. He said it was better than the Yellow Pages because he would provide pricing transparency. Users would know exactly how much was paid for each click." - Both Sides of the Table became Overture and was sold to Yahoo in 2003.