I think the reasoning is Mike is the only one that occasionally does entertaining things (and is great photochop material) and a lot of the fans of other idols are peeved Mike got the save (rather than it being held onto to save their fav) and so every week he stays the more in a tizzy those people get.Crystal (VFTW shout out on Facebook not withstanding) is way too pimped, even with the right on schedule minor depimp she got.
Casey also is way too pimped and I think they want to see Kara's face when he leaves.
Aaron is generally considered the worst singer but too boring to be the pick until there isn't another choice.
Lee also seems too pimped to be the pick until it is him and Crystal left.
Sometimes the entertainment is seeing the fan bases go nuts when the VFTW pick survives and crushes the dreams of whoever they are lusting after.
Because you know as soon as you become the VFTW pick all your dreams are surgically removed or something so it doesn't matter if the VFTW person leaves, being voted off will have no impact on the feelings of the VFTW pick as they also had their emotions removed with their dreams.
The big negative of Mike was they used the save on him, but I think now they are in you saved him when you knew he won't be commercial so now you get to chock on him reasoning.