She had a fairly popular reality tv show at the time and was already pretty well established as an it girl and model. Im hard pressed to say she was fairly anonymous. That’s what made the sex tape such a big deal was because it was of someone famous.
Don’t get me wrong, I buy your story that kim saw the value of the leaked tape. Just having lived through that as a horny young man, I’m not sure I agree with the characterization that she was fairly anonymous.