Thanks for this analysis @abh12345, I have notice what you said about @dtube by observation. They vote on accounts with high reputation and most accounts which have received upvotes before keep receiving.
I have tried @dtube severally without getting their upvotes, I gave up and started using Youtube. I think they should reconsider this and make some adjustments.
Good stats by @utopia.io and @curie who has reward more new users, making their stay on steemit worthwhile.
I'm sorry about your bad luck with @dtube, I hope you can try to get a vote from them at some point.
Thanks for the comments!
Thanks man, i hope so too