To a certain extent i think that it could be a valuable tool if promoted correctly however, that being said, there is no reason to say that being 'certified' by a specific company is going to make a site sell better than the years of trust gained by the well known and trusted processors in use by many, many programs.

After all, what is to stop me from launching 'GWW Certification' and having people pay to use that on their websites, ultimately, unless it is a certification from a company such as Thwarte, i really do not beleive surfers are going to be that bothered whether a website is 'trusted' or not in terms of what someone else tells them, they will purchase on their own instincts and experiences and for most, that means utilizing an established billing processor.

Regards,

Lee