I agree (LOL), in fact, it used to be popular for DJs not to post pricing. I'm not totally sure where this came from but what I can speculate was that DJs would feel out a customers budget as well as venue to come up with a custom price. While I agree some venues are more difficult to work at than others (stairs or no elevator), I don't agree on not having a fixed starting point. I like to be super clear on what I will charge and I never ever add to that.
Some may notice I am a fan of running specials and there is nothing secret behind that. I went to college for radio broadcasting and business. After collage, I went to work for a large corporate employer with hundreds of retail locations. I learned how special really worked and why they were important. Every retail, service, and restaurants uses some sort of special at some point every year. For some reason, in the wedding world, special are frowned on and I don't really know why.
I like to have transparent pricing from the start. I don't want to waste anyone's time. After all, its so important to know exactly what you are paying and why.