I think worse than this is when they actually RENAME completely unrelated (usually foreign, particularly italian) movies for certain releases to try and sell them. There's DEMONS 3: THE OGRE, which is basically, well, THE OGRE, renamed to get sales, which has nothing at all to do with the story, the feel, the idea, the cast, or anything at all, of DEMONS.
While D3:TO was the only phoney DEMONS sequel to exist on DVD, on VHS in various places, there's a grand total of FOUR different movies released with the name DEMONS 3, (only one of which, THE CHURCH (originally planned as DEMONS 3), having any connections with DEMONS), one ORIGINALLY named DEMONS 3 (though unrelated anyway!!) then renamed to BLACK DEMONS, then there's about 3 movies called DEMONS 4, and DEMONS 6: ARMEGEDON (Yes, Armageddon is incorrectly spelled in the name). Some are zombie movies, some demon movies, one a movie about some random satanic sect (!)... I don't think anybody has seen DEMONS 5, but it's renamed from another unrelated movie which is apparently a REMAKE of an unrelated movie from 1960.......
ITS BLOODY INSANE.
Basically, there are two Demons movies and there is a semi-prequel with a different name (The Church). Then there are about 10 random Italian unrelated movies renamed to have Demons in the title to make sales. And they didn't even bother to look for some of the many movies which even resembled Demons, just so long as they were horror movies, and they were Italian... I heard once that even Suspiria and Phenomena have been packaged with the Demons title on them.
Absolutely barking mad.
And we could make all the same complaints about the Italian "Zombie" pseudo-series -- especially the installments that include NO zombies.
Yeah, Zombie Flesh Eaters, as they call it here... I was going to bring those up, but I decided my post was too long and that nobody would bother to read it if I added any more!