Agree that money may not be the only motive. There’s a whole army of people out there producing “images” of the Loch Ness monster, bigfoot, UFOs and other mysterious stuff, just because they enjoy the trickery of it all.
That image of the Ki-15 is interesting as it demonstrates clearly what appears wrong with our image. The glare on the Ki-15 is produced on both spats, along the wing edges, around the engine cowling and on the tail. The same effect is repeated on other images posted here ( #170 and #204 for instance). With our image the light seems to come from the same angle but the distinctive bright glare is only on one spat. Not on the wing edge. Not at all on the canopy. Barely anywhere else that it ought to be?