I can understand that, I did get a dmania vote a couple of times, but it's hard to get a grip on why and how. This is very often the case, also in normal posts, sometimes the rewards on a post are extremely high when I don't expect it. And sometimes, when I feel like, yeah, this post is really something awesome, it gets next to nothing.
Such is the way of Steem, I think.
Note: what really helps on dmania, is following the FAQ rules. If you do not meet the exact criteria / requirements for a dmania upvote you will never get one. That's something I personally learned the hard way.
Good luck!
That is normal and happens on every social media platform, if you think you did an awesome job the ppl are like "meh it's ok" if you just did it for fun and didn't invest that much effort it will rise like a star xD
That. Exactly that.