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I think the issue comes back to 'A little knowledge is a dangerous thing', and a few people do not like being informed of the limitations of their limited knowledge. Many do though, and are grateful for advice: I have just corresponded with another seller, who has corrected their advert, and even asked for advice about another paperweight that they plan to sell.
The seller of the 'Strathearn' has a number of other items listed, and has used their limited knowledge to set what one might think are 'very strong' prices.
Alan