"why do they show previews for the next episode (where every person but one is clearly visible) before they show the conclusion of the eviction ceremony?"

Because this show is badly put together and Spike TV are so strapped for stuff to advertise that they didn't realize they were ruining the climactic ending of the episode.

As for your other questions, you might consider talking that over with your psychiatrist.

This show SHOULD have been a great classic. It should have been made into a really solid 2 or even 3 hour, one time show, in which the whole story unfolds. Focus on the funniest things that happened, leave the filler on the cutting room floor.

The jokes are already old, and spaced out as they are between stuff that is lame at best, the show is fast becoming boring.

"Boring" is the worst thing to happen to a parody. It's trying to get us to care about everyone involved, when the point was to play a huge joke on someone. All I want to know now is what happened at the end. But no, we'll have to drag through more of these lame forced events.

Bring on Survivor and that clown Bob in The Bachelor already. This show is done.