I haven't looked at flipkey yet, if you looked at my badges though you can see a different anchor text is created each time and points to internal pages, which may not work for all businesses, we are all long tail. That being said, the way they were generated (silly search process) was not was was asked for and a perfect example of dev delivering something completely different, as a result of the generation process they have not been very successful, but the final code that is generated is good SEO.
I would use different anchor texts for each badge and not point to the homepage, point to a LP instead so you can 404 the page (which drops the links pointing to your site automatically by changing the URL) if you point to the homepage you'll need to contact webmasters and request takedowns prior to reconsideration request if you get hit.