It's the only comparison you can make, because that's the smallest 4K display on the market at the moment. If you can give me an actual 4K display at 13" and 15", then it would've actually been a bad comparison. Let's say whomever made your displays enjoys a 25% profit margin, so that 's 400 dollars per monitor. 1200$ goes to manufacturing, advertising, R&D, etc. Perhaps 60% of that goes to manufacturing, so 720. The display will be the bulk of that cost, so around 500-600$. If the Asus display enjoys the same kind of margins, so 875$ per monitor, 2625$ goes to again manufacturing advertising, R&D, etc. And let's say again that 60% of that goes to manufacturing, that's 1575$. The bulk again will be the display, so maybe 1000-1200$. Since Apple's rmbp displays cost them 350$ per, and that's around 70% of what your display might have cost to manufacture, so 70% of 1000-1200$ is 700-840. 700-840$ per display is waayyyyyy to expensive to implement into the rmbp. Things may change in a year, but for now, I just don't think it's a viable option.