Some long established c/c businesses do include pricing.............some, very comprehensive listings, others stimulating prospects interest, by listing SPECIAL OFFERS.
If an advert fails to show prices, I keep looking.....................nothing to do with looking for the cheapest, I just like to know what a company charges for it's services / products.
Some suppliers in this industry fail to show prices.....................how many prospects are they failing to reach, never mind convert.
Yes.............every job is different, etc, etc, but, if you want to get a steady flow of work you will get a higher volume of work from priced adverts, how you deal with them will determine their long term value