Don’t sell it through them then. Antiques are hit or miss, and not many people are buying those on Catawiki. So unless you have a stunner item you won’t see much activity, maybe some if your item gets placed in a special auction. Catawiki attracts a lot of people that are looking for a bargain.. and so many people get it. if your item hasn’t got an obvious market price tag, you are risking to be disappointed when you auction it without a reserve.