What is your preferred genre?

Established authors seem to have it easy. They have gone way pass the slush pile and are heard through their works or rather, books. Some authors write a particular genre or incorporate different genres in one or better still, write different genres. Period. 

What might work for someone may not necessarily work for another. We all have different mindsets. Someone might frown on an erotica piece and embrace mainstream and vice versa. 

The questions i have are:

1.) Are romance writers less intelligent as science-fiction writers?

2.) Why do all writers (published and un-published) confine themselves to just writing 'publishable' material because a publisher said so whereas they could explore other 'alternative' genres and reach out to a new niche audience?

3.) Why are the publishable material confined to just YA, Romance, Paranormal (Werewolves, Succubus and hardly any Incubus, Vampires and Witches only) while other genres do not sell as much because the listed ones are the current fads now?

However, writers have the duty to write their passions to a teeming fold of millions of people that can appeal to their imaginative skills. Whatever your preferred genre (under an association of publishers' list of appropriate and sell-able concepts), be a specialist in it, hone your skills and be the best at what you do. Even if a million and one other people are also writing similar materials as you.