You're right about the fact that appearances are way off in numbers, but looking at times, some of the players had video clips that were much longer than others. Some of the appearances were only for a second. I did my own analysis because I was curious
Those are approximates because I can't count partial seconds. The times are uneven among all of the houseguests, and Shon and Rel have less than most of the players, but Queen Brea actually had the 3rd most screentime :]