Yes, these things have and do happen.   But I've come to understand and respect the work that a very small number of individuals do as quality work and isn't the garbage manipulation some have embraced.  Unfortunately, some of the people engaged in this are pretty big names in the hobby. In fact, there's only one person that I would send my books to if I was going to have them pressed, whose work I've seen and been impressed by.  His name rhymes with Chloe Most.