SOME COMMENTS

I understand that bitcoin and steem are crypto-currency. I myself have made almost $500 off of all this. But What I dont understand and get is, why on a site like steemit, do people comment just to get a follow or an upvote back. Like your comment has to have some realtion or something adding to the content, they just without reading it comment 'Oh nice, please look into my account aswell' like Ik youre trying to just make a following and gain money just have some shame