The current system is far too arbitrary.
If two people have similar "fan bases", they are both far more likely to get booted off than someone who sucks but has a "fan base" not shared with anyone else.
For example, if the last three are 1) Clay 2) Joshua or Ruben 3) Trenyce, then Trenyce has a HUGE advantage. The two guys are going to be appealing to a lot of similar folks, while Trenyce has her "base" totally to herself. But if you could vote people *OFF*, the result could be very, very different.