How to correctly determine the commercialization of queries and is it worth doing this after clustering?

Question

Search Engine Optimization

Carried out clustering of semantics in the Key Collector using the method "By search results v3" with a grouping strength of 3 (Hard with a threshold of 3?). A cluster with 55 requests was formed. If I understand correctly, requests in a cluster overwhelmingly have the same intent - either commercial or not. Accordingly, all cluster requests are either selling or not.
In my subjective opinion, which of course may be erroneous, it would probably be the clients who were pulled by the inspection services and these people began to look for performers. This fluid loss test is part of the maintenance, which is a commercial service. But if you look at the most frequent requests from this cluster, then pdf files, orders of the Ministry of Emergency Situations and several articles dominate in the Yandex search results. Yandex believes that such requests are searched for by people who need information, not a service.

Question number 1: Is this enough to make a correct conclusion that the cluster is informational?

At the same time, there are enough ads in the direct, for which the forecast is to write off 100 rubles per click, and in the search results, respectively, this ad is full of ads mixed with organic information.

Question number 2: advertisers are clearly mistaken here and waste their advertising budget on requests that are actually informational, and therefore bring customers with an extremely low degree of probability?

In the quote, the list of cluster requests, sorted in descending order by "!" frequency. On the attached picture, the direct data for the top requests in the same sorting and a screenshot of the clustering settings in the Key Collector.

checking the internal fire-fighting water supply for water loss
checking the water loss of external fire-fighting water supply pipelines
testing external fire-fighting water supply pipelines
testing the fire-fighting water supply system
checking the internal fire-fighting water supply system
repairing the internal fire -fighting water
pipeline fire-fighting water supply pipelines testing of internal fire-fighting water supply
maintenance of the internal fire water supply system
checking the fire water supply for water loss
checking the performance of the fire water supply system
testing the internal fire water supply system
testing the internal fire water supply system for water loss
testing the fire water supply system
checking the water loss of the networks of the internal fire water supply
system checking the performance of the internal fire water supply system
checking the fire water supply
system monitoring the performance of the internal fire water supply system
checking the external fire water supply for water loss
checking the internal fire water supply
maintenance of the internal fire water pipeline
checking the compliance of the water return of the internal fire water supply pipelines checking
the performance of the fire water supply network
checking the fire water supply for water loss
checking the fire water supply system testing
the external fire water supply system for water loss
checking the booster pumps of the internal fire water supply system fire water supply for water loss testing for water loss of the internal fire water pipeline
checking the operability of external fire water pipeline networks
testing internal fire water pipeline taps
hydraulic tests of fire water pipeline
operability of fire water pipeline network
testing external fire water pipeline
commissioning of fire water pipeline
hydraulic tests of fire water pipeline
operability test of fire water pipeline networks
testing of fire water pipeline for water loss
test of fire water pipeline operability
check of internal fire water pipeline for water loss
installation of a fire hydrant on the water supply network
laying an external fire water pipeline inspection
of a fire water pipeline
fire water supply operability
checking the operability of internal fire water supply
networks checking the fire water supply network

Answer 1

I will not consider everything that you have collected. I will show on the example of the request "checking the water loss of a fire-fighting water supply system".
For organic issuance, Yandex put instructions and info materials in the TOP 10. Since Yandex is more likely to focus on the user factor than Google (much more often), this query should be considered informational. That is, according to Yandex, the people who drove in this request were most often satisfied with the instructions. If you want to enter the Yandex Top 10, you also need to make an instruction.
In Google for this query, I saw half of the pages with services. But this system is less focused on the PF and there you can bring it to the top 10 with links.
As for advertising in Direct. Those who ordered it may well be aware that the request is for information. And for info requests, they sometimes run ads to collect extra. traffic. The logic is this: "Look for instructions on" checking the water loss of a fire water pipeline "? Why do you need this hemorrhoids? Contact us and we will do everything for you."
I hope I explained clearly.

Answer 2

just look at the output for the request and determine the case is not tricky,
but what's the point of doing this after clustering then?
that is, if you do not take this factor into account and do clustering right away, why then after clustering should you find out this factor, you have already broken the requests