I think there is a place for tutes for everything. Afterall some of the buyers will be people who have NO experience, maybe have just set up their torch and have taken no classes. Not everyone is able to take a class with a teacher in person so a tute they can buy and download is a great option, especially when they can set up a little studio all my internet purchases.
You seem to have covered all the bases with your explanation and all the buyer had to do was to contact you with any concerns. IMHO you don't owe her/him anything unless they contact you first to seek a resolution.
Kym
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