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.