"If you make people call you can charge each person the exact amount that they are willing to pay."
Not really. You're still going to be the first one throwing out the number. -IF- I call (big if), I'm going to say "Here's what I want to do; how much will that cost". If you come back with "Well, what are you looking to pay", my answer will be to hang up.
In theory posting your prices will have more customers respond since the barrier to adoption is so much lower, and your costs will be lower, since you won't have people calling and taking up personnel time only to realize you're too expensive.
Neither theoretical advantage is a realized advantage.
Not really. You're still going to be the first one throwing out the number. -IF- I call (big if), I'm going to say "Here's what I want to do; how much will that cost". If you come back with "Well, what are you looking to pay", my answer will be to hang up.