But those two tiers are not really competing with each other, are they? I'd wager that most people are fixed in one group: either they will never watch anything with ads (e.g. me), or they just don't care about seeing ads. The former group will never switch to the ad-supported tier -- they'll just cancel if the price gets too high -- so the only calculation is price vs. retention among that group. Similarly, the latter group will never pay extra for ad-free, so it's a completely different calculation. Why are the two prices in competition?