I think there is a definite correlation. Homosexuals are often banished, atleast for a time and in that dark isolation great creativity and ingenuity can result. See, luckier people get completely accepted by society and often conform, which stifles their creativity. Look at the "normal" people: clones, replicas. I can speak for myself and a majority of the gay men I know are amazingly creative because they've been in a dark lonely place before and they say it lent to their creativity.
We were banished, but then we emerged and found the gay community waiting, a place we could utilize all of that good creativity we had pent up. Being different is usually the catalyst, even apart from homosexuals. Creative people can best be described as different/non-conformist and are often treated as such, which is why sometimes after the radiant gay man emerges into the gay community and is completely accepted, he often conforms again, loses his creativity and becomes those dreaded replicas, clones..