Most humans engage in very mundane and trivial activities which would not grab the attention of a high tech alien race.
And while there are many great writers, musicians, and artists to be experienced, their works can be easily downloaded or accessed through hard media or the internet.
It has been observed that UFO activity is common around electrical grids and nuclear plants.
There are also humans/spirits on this planet who generate massive amounts of psychic and paranormal energy. Some may call this power, witchcraft or wizardry, but the Harry Potters and Luke Skywalkers of Teegeeack(earth)do exist.
The truth of earthly superbeings are cleverly masked by fantasy storytelling. Many times, aliens have probed the minds of abducted humans in an attempt to find out the identities and whereabouts of these dangerous and powerful beings. They have failed miserably.
A story that I've started to write concerning this phenomena is called "Death Maze".
The Story Behind Teegeeack
Some Covert Activities Of Aliens