All Adblock does is guarantee that the user won't cost the advertiser any money because the ad is not shown ergo can of be clicked. Google ads are pay-per-click. Adblock does not affect the conversion rate of the people who don't use AdBlock. AdBlock does make it more difficult to reach markets that use AdBlock disproportionately, but those markets don't like advertising anyway, so the difference in reach caused by AdBlock is only a percentage of the user count for the market being measured.

P.S. If you clicked on an ad because it was what you were looking for, then you did exactly what the advertiser wanted you to do. That's the whole idea behind PPC, and why that top spot is such a good one.