I don't run a business, and my employer doesn't even do advertising on the web AFAIK. But I do use the web quite a lot, and I wouldn't want to see it all go away. Even this site is basically a giant ad for Y Combinator that features smaller ads for Y Combinator companies. All of the news sites I read are supported by ads. Most of the discussion forums I've used have been supported by ads. I don't value ads — I value the web that they support.