About 10 years ago there were virtually no spotted or variegated Venus Flytraps reported or photographed in anyone's collection. Then one spotted Venus Flytrap appeared, then another, then another, and soon it seemed like there were a good handful of them (maybe 7 or 8 such Venus Flytraps in widely scattered locations).
I personally don't think that the spots and variegation are genetic, but are instead the result of a plant virus that just happens to not be too deadly to the plant, so the plant can often survive. But viruses are potentially able to spread to other plants through sucking and chewing insect activity, or by the human cultivator using the same scissors to trim the leaves of the variegated plants and regular, non-variegated plants, for example.
Although the variegated Venus Flytraps such as Spotty, Patches and Charlie Mandon's Spotted look interesting, I wouldn't want one in my collection, and the interesting coloration would in my mind be negatively offset by the fact that it is not a part of the plant's own characteristics but instead the effects of a foreign agent (the virus). In addition, although some photographs to the contrary might exist, I've never seen a photo of a robust, full grown Venus Flytrap with the spots or variegation. My guess is that the virus, while not deadly, does interfere with the plant's health and growth, and the spotted plants I've seen (such as the photo posted at the beginning of this discussion) all look small and underdeveloped to me.
I'm very curious about the subject and anxious to read any information that supports a different point of view than the opinions I have expressed above. Those opinions just represent my views about this subject so far, just to add to the discussion.