Many posters, including those with higher reps than mine, feel that since they are writing a post on the Steemit forum, that the #steemit tag is a freebee that they can add on to get more views.
You should only use the #steemit tag if your post is about the Steemit forum/ecosystem/cryptocurrency.
Steem refers to the currency, so you should only use the "steem" tag if your post concerns the Steem currency somehow. (Like talking about the price, technical analysis, etc).
And I have a powerful ally in this, just check out this post:
https://steemit.com/stopusinghashtagsteemit/@berniesanders/please-stop-using-steemit-just-to-promote-posts
Yea, you definitely don't want to risk being flagged by 
https://steemit.com/steemit/@dantheman/notice-to-tag-spammers
It's good to see the whales taking an interest in this.