That is exactly how Google makes their money: target advertising using your information from your Google searches. The ads on the sides are targeted directly towards you so you will, more than likely, keep seeing van ads before white coffee ads. Clear your cookies it might stop the annoying van ads that you want to go away.
BCCI is paying $30k/mo or more for target advertising depending on who they are working with. This can be both good and bad. Good for exposure, bad if they don't get enough interest and people don't click the ads.
Used to be pay per click, now it is pay per viewed ad so they pay their monthly fee
and whenever it pops up on someone's screen they pay for that as well; regardless of the person clicking on it...google figured it out.
Hopefully it's not in vain.