Hmm... all depends on your definition of "conversion". On several sites, a "conversion" is farming visitors off as quickly as possible to another site/partner; and sometimes having an ugly site, with poor grammar and a single link leads to a user leaving the site through the link out of sheer desperation... and there's your conversion.
If you're talking directly about selling as a conversion though, then that's a completely different matter. Many users won't part with their money on a site where the "service quality" is implied to be inferior... as it is when communication (a part of service) breaks down.