Ebay is making policy updates and starting in July, they are not going to allow links to off-ebay sale sites ANYWHERE on ebay property. So you won't be able to link to your off-ebay store even from your 'about me' page!
See 'Updated Links Policy' [URL=http://www2.ebay.com/aw/core/200805.shtml#2008-05-19130839][/URL]