From a functional standpoint, what a seller is really offering in this instance, is a money back guarantee based on authenticity. They use the wording "guaranteed to pass PSA/JSA" because currently they are the most popular choices for authentication.
Ultimately, the choice to send it to PSA or JSA is the buyers not the sellers. Why should the seller pay for the opinion itself, when he/she didn't ask for it? The buyer is likely doing it because they either want to feel more comfortable or they want to resell the item. Neither is the responsibility of the seller, as they have already offered a money back guarantee.
Additionally, for an average seller, not someone who is a known dealer like Jim Stinson, Richard Simon, or Kevin Keating, the price you will likely pay for an uncerted item is less. If the seller got the cert beforehand the price would've been higher to offset the cost of the cert.
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