It's related with the last Google changes
Advertisers have been gradually opting out of parked domain traffic
Advertisers will have to manually opt in domain parking in their Google accounts, and few advertisers will do it
Traffic and search volume remain stable, yet ad clicks have fallen sharply, evidence that the ad pool has thinned, leaving mostly low-paying run-of-network advertisers
I lost about 90/95% of my parking revenue, and you?