It's not a talent anon, it's waking up to the reality of things. The mythos is not extremely rare at all, hell, just look at Arkham and the surrounding area. There's a Innsmouth, Dunwitch, the Church of Starry Wisdom, the color out of space, Charles Dexter Ward, Herbet West(iirc), the Mi-Go, and many many more, all in the area surrounding Arkham, or at the very least New England, in the 1920s.
The point is precisely that these things are not rare at all. they inhabit the same world we do, they do not exist in a separate "other world", the difference between ours and theirs is purely illusionary.
It's cause and effect: once you realize that there's an ancient civilization of fish-men under the sea and you notice the fact your neighbours skin is showing signs of turning green and scaly you're going to start putting 2 and 2 together. Collective delusion is the ONLY reason mankind is unaware of the mythos. The mythos is there and it's extremely open about the fact it is.