Generally stores (real world or cyberspace) tend to go where the readership is I think. Romance has had a large following for many years. Publishers want to make $$ so they tend to stock what they think the readers want and of course authors tend to follow the trends as well in hopes of making a sale. If someone writes a paranormal romance between a vampire and a werewolf for example and makes a good amount of $ on it others see it and figure if he/she can do it so can I and then you have a flood of paranormal romances between a vampire and a werewolf hitting the shelves. And some sellers tend to go more towards just a few genre's that they know they can sell a lot of books in as well I think. Partly that's because the editor and readers tend to buy what they themselves like. You can write a great SF book, but if the readers and editors of a publisher don't like the genre you won't make a sale. And so there are online stores that cater to certain genre's and sub genres.
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