Wanting to sell a 50p

Can someone please explain why I am not able to sell a  50p coin for the first time but lots of other people are selling the same coin 

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In addition to the information you have already been given, the other sellers who are currently selling coins on eBay are more than likely to be sellers who have either gone unnoticed and haven't had their listings pulled, or alternatively they may still be on the old system, in which case they will still be able to list coins for sale until they're switched over to eBay Managed Payments.