It's probably because no other fourth place finisher had family in the audience. I think Big Brother has always been cheap and they would much rather have past contestants in the audience than real people. Let's face it! On some evictions, they've basically had to pull staff in and so on.
Now on to the cheapness of the show. Why is that only Jackson seems to have made real money on it?
I guess he's the poster boy from now on. Do you even remember who won the show or is it the ones they choose to promote (like Tyler)?