Posting an enormous number of "thanks" comments could be seen as comment spam. Cause you are repeating the same comment again and again. Please make an effort and post comments that are unique. Like for example,

"Thank you for you appreciation."
"Thanks a lot for the praise."

I am not saying you have done anything wrong but posting low quality content hurts the site overall and may lead to decrease in steem price. Which will decrease all of our steem reward price.