How can a post on steemit have 40 views and 240 upvotes?

I have noticed that many posts on steemit have very few views but a lot of upvotes. I know that sometimes one can just upvote a post without reading it... but doesn't it seem strange? My recent post has about 500 views and only a few upvotes (( it's unfair....

Please, explain me how it works....
I know that there are some groups where people share their links to get upvotes.. but it doesn't work for me..