I suspect at least one reason for the limit is so that no one person dominates the awards. Back about five years ago, they didn't have a limit, and a couple of well-known authors pretty much swept the awards.
They were average writers, but they were very well-known and popular for the pairing they wrote and the fact that they wrote fluffy, sappy stories (which people tend to like).
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They were average writers, but they were very well-known and popular for the pairing they wrote and the fact that they wrote fluffy, sappy stories (which people tend to like).
Hence the limit.
Thanks, and good luck!