You want to know a dirty, filthy secret about the entertainment business? It's a business. Nobody wants to buy "good" scripts, because some abstract sense of quality doesn't pay anyone's bills. What the industry wants is commercial viability. They want safe bets, stuff that will be easy to market. They want sequels, spin-offs and derivative ideas that are familiar but
just novel enough to be acceptable. That's what sells advertising, gets the viewers and puts money in the bank.
What writers don't understand (and what they'll rarely be told) is that paying your dues is largely a process of disillusionment. To put it kindly, the industry wants sensible, informed writers who understand how TV is made and know how to write scripts that are easy to shoot and suit the medium. To put it less kindly but more accurately, the industry wants cynical, desperate writers who will write whatever cheap nasty dreck pulls in the viewers.
Paying your dues is like a gang initiation, social proof that you're willing to crawl through Albini's trench of shit to get your script into production. Every menial chore that you perform, every late night you pull, every arse that you kiss entrenches you into the industry, further investing you in the payoff of getting commissioned. The longer you've been a dogsbody, the more confident a commissioning editor can be that you won't argue when they bring in a script doctor, when they ask for a few "tweaks", when they decide that a page one rewrite is in order. They know you won't argue over the casting or ask for too much money.
Entertainment is a shit business, don't let anyone tell you otherwise.
http://www.youtube.com/watch?v=svCA3DJRgfI