I have been a seller on Fiverr for several years, reaching Level Two status.
In order reach the higher levels, Fiverr have a series of milestones an account must reach such as reaching a certain numbers of completed orders while maintaining a high level of feedback and meeting delivery deadlines.
In order to stay a Level Two sellers, a seller must maintain these levels. However, since competition is sometimes high, it is possible to
By simply placing orders, then cancelling them with a seller, you are able to impact that seller's ratings, and therefore remove him/her from the top slots of the Fiverr search results. This will impact his/her earnings and as good as erase any good standing he/she has earned.
This has happened to me and Fiverr support have told me they have no way to counter this.