Kim Kardashian has a big ass and a sex tape. Specifically, she had one near when this whole leaked online sex tape thing was first getting its legs out from under it, so she got a lot of attention for fucking what I would think is probably about an 8, but I have absolutely no idea how men rate on a ten point scale of attractiveness. I know that I’ll always be grateful to Ray Jay for the phrase “smashed the homie,” but beyond that he seems to be on the same execrable level as every other reality television star.
Kim Kardashian is related by marriage to Bruce Jenner (stepfather), and D-List celebrities from the years that nobody remember are reality gold, so her whole family ended up getting sucked into the show. That’s where the other, obviously less attractive than Kim but clearly related to her women come in.
Well, turns out you can only shoot maybe one and a half seasons worth of episodes in a year, so E! needed another way to fill out the brand. Thus, the spinoff shows with Chloe and…uh…the other one. CKourtney or something. Plus, those two are more interesting personalities as compared to Kim, insofar as they actually have personalities and don’t resemble an advanced experiment in sex robotics from the world’s most Japanesest scientist. Then one of those married Lamar Odom, which means that now there’s two legitimately sort of famous people in the family, and one of them has the apparent IQ of a smoked cheese log, which is…hilarious, I guess?
tl;dr - Kim had a big ass and a sex tape and knew some people and E! had a couple of slots on the network to fill.