You will eventually get answers across the entire range of prices if you keep the question going long enough. Personally, I have found that at prices even vaguely like the ones you are considering, the amount of time-wasters you get is incredibly high because they have NO investment in what you're doing. When you don't value your own work, nobody else will either. I charge $250 and up for a sitting fee. I get a lot of "aw shucks" responses, but it ends there and the ones who respond positively are more likely to show up, on time, and pay in full. Then again, I'm shooting with an antique portrait camera on large format film and producing platinum prints.