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Have you actually used the service before? They have a very good upsell service for order add-ons, a lot of them with fees much greater than the $5. For many sellers, the $5 is just a foot-in-the-door sales method to acquire the customer, much like the freemium model for saas companies. They may lose money on the initial $5 order, but they make much more on the percentage of customers who purchase add-on items. This is no different than other customer acquisitions strategies, if not cheaper. See how much you need to spend to acquire a design or voiceover customer via Adwords, as an example.