On the topic of Sushi Restaurants, you have two fantastic resources available to you anyway - technology (Google Maps, for example) lets you find the closest restaurants and ratings for those restaurants polled from various resources. If you do not trust Google, use another mapping or restaurant critique service. Alternatively, you can use the ancient-as-human-civilization method of social web information about quality. The vast majority of purchasing decisions are still made through the influence of peers, rather than by advertising, because you trust your peers recommendations way more than what you see on TV - for good reason.
In either case, they provide broadcasting as well, and in all cases, they are inherent to either the Internet Age or human organization, and do the job better than emotional splurge-purchase decision TV ads ever could.
Of course advertising has a use, but without advertising it's not like you would "have to research the 85 sushi restaurants" in your neighbourhood.
Put it this way: I use adblock, I do not watch TV nor go to places which actively advertise. My life is fine, and I don't have to "actively research" anything unless I specifically want to. In fact, compared to people who don't avoid ads, I tend to spend my money a lot better... something to think about.