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WE have no idea that females have been discounted on purpose.
It's true, I don't know for a fact that they haven't audition actresses. But... if I had to make a guess, they didn't for the first 45 years of the show at least.
And for up and coming actoes like Tennant and Smith spending that much in Cardiff has hurt their careers
?? Playing Doctor Who hurt their careers? How so?
but then it didn't really help Eccleston's career that much either. Playing the Doctor really hasn't helped out any of the actors who's played the Doctor.
1. They all continued to work. Davison probably the most broadly. So, I guess the question would be: what do you mean by help? They all work, probably Colin less so, they attend conventions, they record audios.
2. The show now is a much bigger thing than it was during the classic period. A much much bigger thing.