Could a girl do dp in all her scenes for her entire career?

DP and of course DPP and DAP and TAP is what most of us watch these days. Unless the male actor is Rocco or someone with a thick cock and anal skills I rarely watch 1 one 1 anymore nevermind solo or lesbian scenes. So when it comes to the best and nastiest girls, why do they still do so many vanilla scenes? Is it because the studios just can't afford to pay two guys and the girl extra for every scene? Since the girls can do 1 one 1 in their private life, I would expect they would crave dp for work.