In these times of "austerity" would you call someone without knowing a possible figure you would be paying for a service?
If i wanted an electrician to come and do some work for me it would be a given that i expected him to complete the work to the required standard and that i was happy, that would be before i called him. I would then firstly call one that had a price guide advertised on his site so i have an idea of the cost beforehand, if i couldnt find one with a price guide my first question would be "how much"? "well sir i am a top pro, i have 10 certificates and 100 years experience!", yes but how much is the question i asked, the expectation is that YOU will do the job properly, YOU dont have to sell me that bit, its expected already.
I advertise a price guide because thats what i would look for and i dont like wasting time having to justify my service, either your happy to pay the price or not. It also means that you can get most of the jobs that present themselves to you without having to justify yourself, the phone may ring less but your success rate will increase.
Thats just my opinion but it works for me.
Tony