I had a similar situation (with a pair of $25 earbuds). Amazon took my review down for "promotion", presumably because I included a picture of the card with an

I had a similar situation (with a pair of $25 earbuds). Amazon took my review down for "promotion", presumably because I included a picture of the card with an email address to contact if you wanted to be compensated for your review. Probably 75% of my deleted review was about the item itself.