But we're ALREADY paying Netflix. They don't need ad revenue to fund their servers, they're not just some wannabe journalist blogger whining about the lack of donations. Advertisements plus a subscription is just stupid, or evil, or both. Same with cable tv, but there we could easily fast forward past the ads and never see them (the evil ad industry even sued replaytv over this capability).
Post-show ads are ok, we can skip those. Ads on their homepage is fine. They can even have a special "Netflix Originals" category (which I suspect some people would like). But non-skippable pre show ads would drive away a non-trivial segment of their subscribers, including quite a lot of people who decided on Netflix over Hulu-Plus.
Netflix needs to remember that we cut the cord once already, we can cut it a second time if needed. People are assuming we must watch the shows, but it's not true and we've learned to cut back. Anyone already using torrent is probably not concerned about being legal with netflix anyway.