I sort of see where you're going with this, but a large part of the equation missing (at least in your outline; not to suggest you're ignorant of it) is 1) startup capital (they were already wealthy) and 2) a powerful and influential network. Their skill was leveraging these things, of course, so I'm not saying their success was inevitable, but even having those opportunities in place for Kris, Kim etc. to build on puts them far ahead of most people trying to enter the market. Maybe before trying to figure out how to appeal to the mass-market like a Kardashian, try figuring out how to appeal to a small but dynastically wealthy and famous market like a Kardashian ;)