Cause FOX is run by a bunch of horrible people who hate quality television. Yeah, I'm bitter.
Actual reason? They decided at the last minute that they didn't want a long 2-part pilot and made Joss write and creat a new pilot (Train Job) at the last minute. They decided to air the original pilot as the last episode. Probably because they felt they should actually air the episode they had been advertising for weeks.
Yeah that's right, they still used the promos for Serenity even after they decided not to air it. The final line of the promos and commercials was "and there's a girl in a box". Suffice to say that those who tuned in were very confused.
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(Maniac64 at work) [Browncoat] ~Board 570901~
All the proteins, vitamins, and carbs of your grandma's best turkey dinner, plus 15% alcohol.