This has now been added to the rules and guidelines:
(8) You must not list items for sale at higher than the recommended retail price. The marker of RRP will be determined by cross indexing with Amazon for example.
Also in the Code of Conduct:
• Items listed for sale at higher than their face value or recommended retail price will be removed. Any exceptions will be decided at the discretion of Admin or Moderators.
can't agree with that last rule,i think this is why alot of people use here rather than ebay if you take away the right for members to list their item at the price they feel it's worth then they will list on ebay plus it hardly ever goes for the price they list for just my opinon.