I am not an expert on eBay I am just commenting on the legal/moral objective of their policy and your own moral responsibility. But consider this, and believe me I am not sticking up for eBay here. You have an item you want to sell, you have options like news paper classified, community notice-boards/auctions etc.etc. You choose eBay and you know it has a much bigger traffic looking at your item for sale. You have chosen to display your contact details in camouflage, which is against the eBay policy. Joe Bloggs happens to be meandering through the eBay items that interest her (yes, Joe is a female these days) and sees your phone number, she calls you and arranges to inspect your item She likes it and pays you cash. You delist the item. eBay, having provided you with the means to sell your item miss out on their cut. Now I am sure if you were providing a service and it was used by someone who is avoiding your charges,then you would be a little offended. would you not. I think most people would. It just so happens that eBay is a huge company that makes megga dollar profit, but this does not preclude them from wanting a return on their investment as any company/individual would.
Regards
Vince