So, just to clarify; your mate, who already had his own account, but hadn't bothered to apply for trading access (which isn't exactly a hard task) used your account to post his bike for sale.
When you didn't like what everyone was telling you about the price, you denied any responsibility and told everyone to send any inquiries to his account, which I can only assume still doesn't have trading access. AFAIK, if you're going to sell a bike for a friend, you've got to at least take full responsibility for the sale.
Now you're bumping the thread, who is using the account now? Who should people contact if they're interested in the bike?