Many successful (and unsuccessful) authors have to make a choice about what camp they’re going to sit in. Usually, though, that choice is made for them. When an author writes a fantasy book, and it becomes successful, he’ll forever be known as a fantasy author. It would behoove him to keep writing fantasy if he wants more success. These genre authors are usually scoffed at by elitists and pretentious writers. Which, I shouldn’t have to say, is pointless and cruel.
However, when I first began writing, I never intended to be pigeon-holed, come hell or high water. There are writers who love a genre so much they never want to leave. Others, like myself, would rather just be a writer and leave it at that. But most writers start out not wanting to write one genre but are forced into like I mentioned previously.