living beings r constantly evolving & thus, changing. the fact of 2 living things are enjoying the process of observation(and or interaction with) of each other does not mean that the joy will last forever, because those 2 living things r different by the nature of things(the only fully identical living thing for one is oneself and nothing else). on the other hand, static("dead") content, which was generated by living things, has its own state as well as their current state reflected on it. this mixed state will never change, thats why some otakus like one anime & dislike other.
the computer system can easily(comparing to biological system) search more relevant(to user likes and dislikes) content. so, that way, user have to spent less time for consumption of not satisfying content("like" or "dislike" is a thing which discovered only after user has consumed content).
it is like kym has it's own type of content and kym itself as a user accepts only satisfying(kym has rulez 4 allowed content) content.
i dont know how others, but i dont need living, changing, evolving users, i need "dead"(static) content, so i can enjoy the observation process forever(as long as i want)!
there are tons of content on kym, and i have really slow interface(my physical biological body is not that fast as a computer) to consume it!
things which can be considered as static content and can be liked/disliked are: images, videos, user comments.