Fiverr buyers are really weird. I have some gigs at fiverr. Though I didn't expected and didn't ask, today one buyer left positive review for just providing 2 backlinks details. While another buyer whom I specifically asked to leave a positive review and to whom I provided a huge 75K backlinks details, didn't even care to reply. It also happened while ago with my another gig. The guy rejected my work and asked something more. It wasn't much time consuming so I did but he didn't even care to leave a review.