It appears that google does not care for its customers , and has no qualms in wasting their money in harassing some google users.
For example if the domain investor is visiting a large number of websites, which are being monetized using google adsense, the internet user will often see the same ad on all the websites for a day or more.
The ads are no longer contextual ads, they are stalking ads and instead of branding , they are creating the wrong impression, wasting money.