Fiverr is more like a virtual consignment shop (like Etsy), they are funneling the customers to a conglomerate of storefronts. You agree to the terms and pricing set by them to manage the sales process in your store. They take enough money from us that they better be there to mediate when things inevitably go awry.
I've had maybe 3 or 4 sales go this route in the 6 years that I've been selling here. I've had to mediate them through CS for each one because my time and sanity are valuable. I'm not here to spend days in back-and-forth with someone who has no respect for who they are working with.