The reason for making Utau covers as for me is this:
I love this song! I want to tell it someone, but what should I do? Oh yes, make a cover!

That's the reason. I always do that for it. It's like humming a favourite song.
Unfortunately I often fail it. I failed it this time, either. But my every troubles and slumps were given a big reward from comments on YT, I think. (T_T)

Honestly I never make covers for comments or popularity, or for anything. I do make covers for love with the song.
Therefore I never expect to gain any collateral. But I'm sure that supports my heart, even if that was not motive.