To take this line of reasoning a step further, you're not really acting in good faith if you view the ads without ever buying the products or services they advertise. The advertiser pays the provider of the site in the expectation of a reasonable conversion rate. If you don't want to buy a certain reasonable percentage of products advertised to you, fine, but from an ethical and legal standpoint you shouldn't be forcing them to waste their advertising budget on you. Doing so diminishes the advertiser's incentive to support the site whose content you're consuming.
Here are some terms of service for you. When you enter into any business venture, you accept the risk of it not succeeding. Wishful thinking notwithstanding, the consumer is under no obligation to indemnify you against it.
Advertisers either pay for impressions (CPM) or clicks (CPC) or directly for conversions. They don't pay for conversion rates - if rates are too low, they might not buy CPC or CPM campaigns any more, but you can't generally get a refund for a CPM campaign because your conversion rate was too low (barring clickfraud.)
Here are some terms of service for you. When you enter into any business venture, you accept the risk of it not succeeding. Wishful thinking notwithstanding, the consumer is under no obligation to indemnify you against it.