And they added features in the past without raising the price. This is purely a play to keep demand low due to low yields.
*Any* extra costs incurred by Apple, resulting in a higher COGS, will be added (along with their respective margins) to the price of the phone. It's also important to distinguish between net and gross profit margins.
GPMs are generally much higher. At my last tech company, GPM targets were around 80%. If I were to propose a product that doesn't at least get close to that number, it would never get off the ground. With respect to publicly traded companies, it's about Wall Street expectations. And profit margins are a huge analyst metric that companies live by.