Heh, your customers are unreasonable, but mine are murderers. I rarely get a chargeback. Last one I had, the individual claimed her daughter-in-law had used her card without her permission, and then her son murdered the daughter-in-law, so the daughter-in-law sure couldn't speak for herself and whoever got the merchandise (which btw was stuff intended for spiritual development) didn't return it. I lost the chargeback, but I have to say that I enjoyed reading about these unbelievable skeevs and feeling grateful for my uneventful life.
So far, no one who has bought a custom item from me has done a chargeback, although I did have a close call due to delivery problems internationally. That made me change how I have such things delivered to Canada.