I talk to people often who have jewellery with an appraisal 'for insurance purposes' which says their item is worth £10K or whatever. I then ask them out of interest how much they paid. They look smug and say ' £3K' meaning they think they got a great deal. It hasn't occurred to them that they are having to insure a £10K risk on something with a replacement value in the trade of maybe £1K. Appraisals are a massive con and no one catches on until they try to sell and wonder why they recoup a tiny fraction of the stated value.