There have been many times that I have taken over what another seller on Fiverr started to finish the work. The reason for most of them is that they hired someone prior that did not have a clear understanding of the task at hand. This has especially happened with my USA buyers that selected people located in other countries.
Fiverr has talented people all over the world and there is nothing wrong with purchasing their gigs as long as there is a clear understanding of what you are expecting. Communication barriers can be hard on both parties.
My recommendation is simple. Before you purchase a higher priced gig, just shoot a message to the seller and see if they can communicate back with you and understand exactly what you are wanting. Just a few messages back and forth can save a lot of time and prevent frustration later. This is not just for USA buyers, but all of them should try to communicate with the seller. This can also give you a good idea at how responsive a seller is.