That's how for-profit world works. It's not about providing value to customer - it's to provide as little value as you can get away with wile still getting paid. If a company can sabotage their customer's experience and make him pay more at the same time (whether directly or via ads), the company will pick that option.
This is the incentive gradient that's present everywhere, especially on the Internet - that's why I personally won't mind if ad blocking will kill all ad-supported websites. I'll call it good riddance.
[1]https://web.archive.org/web/20090117041216/http://metacritic...