I was a seller and buyer too. I am a qualified expert too. Catawiki undervalues the seller s item .They also have stupid rules with the starting/reserve price. In the first times if you could not sell your item, after the third try you could not set reserve price up. Nowadays its happening after the first try. Catawiki does not give fair valuation which can be misleading to sellers who dont hold experience/qualification. ( For example: one of my item sold on Catawiki for 420 Euro, but luckily the buyer didnt pay for that. Few month later I could sold that item for 1200£ on different site .) Customer service is also very bad. Their payment system is also unfair.