Re: there's plenty of people willing to see ads
It is because they work. Harvey Norman is horrendously over-priced, and staffed by morons. But when people think about buying a fridge or a new computer Harvey Norman is on their list of places to consider. Their ads are the epitome of "yell at you" advertising.
You with your tech background will probably never buy anything from them because you can find the same product cheaper elsewhere. But the 80% of the population that find turning a computer on hard WILL go there.