Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
If you look at the business seller information for the previous listings, they seem to vary. I wonder if they realise that by selling as a business that their address is shown to all and sundry.
Had it got to the stage where they get your address to dispatch the item?