Imagine 2 possible worlds:
a) No psychics exist due to the fact that anomalous information acquisition is simply not possible i.e the physical laws of nature prohibit what we refer to as ESP.
b) Psychics do exist, but they are comparatively rare.
It is clear to me that in world "b" there will be more fake psychics than in world "a". Why? Here's an analogy. If we lived in a world where £20 notes didn't exist then it is likely there would also be no counterfeit £20 notes either. There would be no purpose in counterfeit £20 notes since no one would be fooled by them. However in our world where £20 notes exist and they are in demand, then inevitably there will be many counterfeit £20 notes.
Similar reasoning applies to psychics, albeit to a lesser degree. That is to say in world "a" there will be fake psychics, but it seems clear to be that they will not be as numerous as fake psychics in world "b".
Skeptics of the paranormal often allege that the discovery of fake psychics provides compelling evidence that genuine psychics do not exist. But since there are many more of them in world "b" this is not only false, but arguably (and admittedly counterintuitively) makes the existence of genuine psychics more likely.
In addition they sometimes use the argument that since every psychic they have heard about turns out to be a charlatan, then it is reasonably, via induction, to infer there are no genuine psychics. But this is rather like a person flicking through a wad of £20 notes, carefully removing the counterfeit notes which are fairly easy to discern with the naked eye, and then declaring that since every note they've examined so far is counterfeit, it's reasonable to infer they all are!
In other words skeptics focus on the easy targets and insinuate that similar debunking can be applied to all alleged psychics. And this is the strategy that skeptics of the paranormal seem to me to apply across the board to all paranormal phenomena (to be fair though such underhand tactics are pretty well universal no matter what the subject matter happens to be i.e. people have the propensity to attack the weakest articulation of a position or resort to attacking straw men, and to avoid addressing the strongest or most compelling articulation of a person's position on any subject).