Not sure how much you can actually read into that, though. Beasts of Chaos for example was a small release with just the terrain and spells, so it’s easier to afford the LE book with that. There were loads of models for the Gloomspite release, so people may have passed over the more expensive book in order to get more models.
Lots of the Gloomspite stuff went out of stock from what I remember. Not that you can read much into that either without knowing how much was made, but I haven’t had any impression that they were an unpopular release.