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For one, there just isn't anything substantial or provable about it. One person can search for the same thing over and over and that doesn't make what they're searching for more popular. And when it comes to fucked up fetishes like NTR, scat, rape, etc. we all know that the people using these search terms are gooners and habitual porn consumers, totally addicted junkies. The consumers of this kind of porn consume more porn than anybody else and are consumed themselves by the need to constantly seek out more shit.
Secondly, it works the opposite way. A high amount of searches, to an extent, actually indicates a lack of popularity. The majority of users love the most popular tags by definition. On DLsite, these users don't even touch the search function. If you love porn that depicts vanilla sex with a childhood friend who has big tits, you don't have to use the search function because that's what shows up on the front page. That's what shows up when you sort by most popular, or best selling. There's virtually no NTR on DLsite that can be found this way. It's so unpopular that you HAVE to search to find it.