The price and the value of a deed are not equivalent terms, since their setting depends on totally different parameters. As we have already repeated on many occasions throughout the deliveries of this blog and the web pages, the price of a deed depends on the application of the rules that regulate the Notaries' tariff, which is from the year 1989, with successive modifications, always downward. Therefore, the price of a deed, in theory, is the same for all notaries in any town in Spain, and although it is true that there may be certain price differences, it is normal that they are insignificant, as long as there are a correct application of that tariff.
But the price of writing is very different from the value it can have. How is that value measured? In my opinion, it has all the complexity of the valuation of intangible elements, but even so, I believe that an effort can be made, in its quantification, which could be in the sum of the cost of the problems that it solves, and the cost of the problems and future expenses that you avoid.
That value of the deed does not depend on the application of the notarial fee, but on the way of working of each notary. And from this point of view, each writing has a different value, since there may be writings that do not contribute anything, or that are nothing more than a source of future problems.