This seller seems to be getting about £1000 per month on bikes. All the buyers can be traced (So some of the bikes can be recovered if the police do their job).
He has been registered with E-Bay for over four and a half years, so could have been selling bikes the whole time.
Assuming he is selling stolen bikes he is getting over £10,000 a year from the proceeds of theft, hardly a minor amount, could top £45,000, and I assume he's not paying tax.
Hope this gets the ending it deserves, will watch with interest.