When I'm questionong a lyric to a song. Or I feel like singing along.

But I don't think there needs to be so many for every song.

They're great if you don't know the lyrics well :)

They annoy me:/ I prefer the actual vids and Googling the lyrics.

^ So the actual vids would include unofficial vids?
The reason why I ask this is because only singles get official videos, & I know I listen to more than just singles. But then that brings up the problem of unofficial videos, which just annoy me to death & I never watch them. I prefer to watch a lyrical video in this case, such as these:

link
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All credits belong to ZytkaPants & Sick Puppies <3

I don't always watch them just to read the lyrics, sometimes the only video on YouTube with the song is the video with lyrics. But usually if I want to sing along I just read the lyrics on another site

AS the official videos are mostly blocked in my country i love the lyric videos- because you can hear the song mostly in a good quality ( a better one than in life videos) and i'm interested in the lyrics too :-)

Good for helping you to learn the lyrics! :)