The rarity or peculiarity of something is what usually attracts the most attention or is distinguished from other things. An original story or photo usually leaves a lot to think about because of what you say, we wouldn't be used to it. Great ideas are born from our creativity and that is more valued.
You are so right. If we weren't so actively immersed in our creativity, we wouldn't be able to think up such exciting stuff to post. We have to live on a creative high all the time, to be permanently inspired.