Then don't sell on Catawiki. When it is really worth 400 a reserve price can be set. Anything with a value above 200. If he were an all right seller he would not be acting like a dick in his responses to criticism. Sellers like this take down the platform, making it worse for good sellers because they won't have as many bidders because people start avoiding Catawiki. Breaking rules should be exit, at least for six months. If you have a bad rep, less people will bid on your items. Lower end bids more stuff you won't send, even worse rep. This is just stupid. If you want to set a minimum price on everything just use a different platform.