I see the problems that show up around the forums too. Just like the one that started the other thread that spun off this one. It is serious to the people involved and should be taken care of. What you don't hear about is all the thousands of transactions that take place every year and don't have a problem. There are a bunch of good people on both sides of the table in this business, but it is the bad deals that create the threads with the most responses.
In any business I have ever dealt with it has always been cheaper to keep a good customer than to find a new one. We all make mistakes or have problems with something we made or sold sooner or later, and we end up with a customer that is dissatisfied. It is how a business man deals with these problems that separate the good ones from the bad ones. Many times you can take a situation with a customer that is dissatisfied and win him over by being honest, backing what you made or sold and accepting responsibility for the problems. You can't do this by ducking the issue or by avoiding contact. If a customer has a problem with a knife, what you have, as the maker, is the chance to demonstrate how good your guarantee is to that customer. Hopefully you don't get this opportunity very often, so you want to make the best of it. The goal here is not to just satisfy the customer, but to make him glad he did business with you to start with and comfortable with the idea of doing business with you in the future. Depending on how you handle the situation, it can pay dividends for years to come, or cost you dearly in the long run.