The problem is that the internet is not symmetrical. Eyeball ISPs will always have 100+:1 download vs upload ratios. So they can't ask for 1:1 peering ratios. I'd say the ISP benefits from the peering with netflix, they get happy customers, netflix doesn't soak their transit, and they get more control over where netflix enters their network. Peering + local caches can reduce the 'cost' of netflix to the ISP to just some switch ports.