I would distinguish between freelancing writings and creative writings. In the first case I could say yes, especially if we live in a tier3 or tier4 country and we earn dollars, euros, pounds. In the case of creative writings, during these times non that easy, as many factors and circumstances are involved (language used, reading habits of our acquaintances and in general, reading habits of the population in the country we live, if we decide for paperback, e-book or both, to name the first circumstances). I'm a creative writer and I combine various streams of income, as I find impossible to survive on my creative e-books only.