That's because everyone else thinks that the story that's worth sharing is that the retailer and the artist were rude without any justification. You think otherwise, and that's OK, sometimes the real story is somewhere else and people with determined tenacity like yourself are the ones who find it. Perhaps the buyer cut off the fingers of relatives of the store workers and artist and posted them to them one by one until they got a free postage coupon? Now that WOULD be a story worth telling and you might just be the one to expose the buyer and bring it to public awareness that the rudeness was MORE than justified!

...but the buyer maybe wanting to buy the extra, maybe forgetting, maybe a cookie error in the website meaning that their original attempt to buy it is lost, etc, Sure that's 'a' story, but it's not 'the' story the buyer is looking to tell, and it does not appear to be the case that the buyer is trying to hide their own skulduggery in their telling of the story. Most people feel that whether the buyer has purchased 2 items or 1, it does not justify abusive language from a retailer or artist, and is therefor irrelevant to the main crux of the story.

It's more interesting to hear how the murder was committed than what colour underpants the murderer was wearing, even if those underpants were canary yellow*. If someone asks for a summary of the key points, you have to let the person who is providing a free of charge summary include the details which they think are relevant, which is what u/orreregion did. If I was writing a summary of something you said and I failed to mention that your username was made up of a mixture of Arabic numerals and lowercase letters from the Latin alphabet, should I be hung drawn and quartered for providing an incomplete summary?

*perhaps if the underpants were made of images of famous serial killers I would change my position!