Netflix is running ads, which it insists aren’t ads
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However, the ad trial is likely meant to open the door to new pricing options that do more than tweak the number of simultaneous streams. Netflix could offset price hikes (and undercut streaming rivals) by launching a cheaper, ad-supported tier; alternately, it could compensate for slowing growth by asking you to pay more for ad-free viewing.
Now Netflix is in the same boat. Obviously, they are looking to generate more revenue, but given that selection isn't a big draw, no commercials is a major feature. If they want to use commercials, they need to offer an option out with a higher-priced tier. I don't watch a lot of movies on Netflix (because the selection isn't so great, but there's a lot of cool older stuff on there), I mostly watch old TV shows (right now I'm reliving "M*A*S*H"), which I really enjoy and find it a great value. I _will_ pay more for no commercials if I have to, and if I can't, I'll consider dropping Netflix.