Uncle, your expressed and genuine sentiment on the "thanks for interest" E-mail is a nice thought and the idea is based upon generally good marketing practice.
But I fear that in today's #@&&^% environment, you might actually scare off potential customers in some states and municipalities who are justifiably concerned about hanging onto the knives and fierarms that they currently own. Add to this the general climate which includes fear of stolen online financial identities and fear of goverment spying on citizens, I just don't think this is a go. I don't think it would be interpreted the same way as the guy at the store whom you've never seen before looking at the name on your credit card or check saying "thank you Mr. Martino".
In some ways, its a sorry world we now live in. But there are enough crooked and mean **&%^^$ around that I'm glad Beo thinks this is hard to do... because it's hard for the bad guys too.