But why does google allow unverified owners of a domain to buy ads for it? Surely only ticketmaster or agencies approved by ticket master should be allowed to do this?
Source: I've also thought this was ridiculous and asked someone working on the adsense team. Apparently tried enforcing some domain verification mechanism in an experiment, but most companies and agencies struggled to get the verification done and of course the $ metrics on this launch dropped, causing execs to force them to stop.
Allow sites that are heavy targets of this kind of scam - like ticketmaster - to add a "AdSense: locked" line to their robots.txt (or similar) - if that line is present then advertisers have to go through an additional domain verification step in order to place an ad.