To the outside world she may be. Part of what we're trying to do for Brenda is reinvent her, make her in demand again. Having clients who are well respected in their field makes it more legitimate for me to pitch the rare unknown writer. It's a lot of legwork promoting an unknown, which is why we rarely do it. The amount of work and the payoff don't coincide.
Most unknowns develop large egos after a sale.
More so in television. I don't really think it's fair to call it Ageism, Sexism or any other kind of ism. That just doesn't make sense. It's about who is right for the job. The person who is right for these jobs are the people who relate most closely to the characters.