Smith and Herbert are just two of a kind in my eyes, Jack - people who started writing crap in the 70s when people were less demanding with what they chose to read and subsequently never got round to modifying their style and developing their writing to keep up with the changing demands of their audience. James Herbert did at least write a couple of books I like - Haunted is a superb, old fashioned ghost story for example, but his best known books, The Fog and The Rats are laughable to read today because they're written in such an old fashioned prose. I imagine that 20 years from now, people might say the same about Richard Laymons work. They're very much books of their time.
Guy N Smith found a method that worked for him, but his books are awful. Despite this, I somehow managed to accumulate a fair few of his titles over the years when I was a bit less picky with the things I read. I had Cannibals at one point, but its at least 10 years since I read it. The last time I had a big clear out I got rid of most of them. Some sold on ebay (for not very much, as you might imagine) and some just went in the bin. I've got one title left now, lurking in the back of the cupboard, called Satans Snowdrop. Its only survived the bin up to now because I'd clean forgotten about it until I read Guy N Smiths name mentioned again. If you've never read it, Jack, PM me your address and I'll stick it in the post. It may as well go to a home rather than be consigned to a landfill site.