Curious, is there a link to your site on the printed card? It's a better user experience for the recipient if they don't know how the hot dogs are made.
You are essentially sacrificing your product's value for word of mouth.
He very clearly mentioned that the response has been more warm and positive than negative. So it seems obvious to me that they are not sacrificing their product's value at all.
Maybe that's true so far, but I suspect the early-adopter users are more forgiving of a lot of things. The hockey-stick users might be less so, and IMHO they need to be looking forward to those.