I sold a few bows in the past, mostly donate them to charity auctions now. The bottom line is you have to stand behind your bows, if one breaks, replace it or refund the purchaser's money, no questions asked. I give a year warranty but have replaced a bow that was on it's second owner because I felt it was the right thing to do.
And yes, they will break and fairly often. I got a run of bad bamboo once, every bow I made from it had a bamboo failure. I spent 6 months in my shop working feverishly to replace broken bows.
Several wood bow makers have gravitated to glass laminated bows because of the unavoidable failure rate of wood bows.
You may make one that you can shoot a lifetime but put the same bow in someone else's hands and it may break. If you make a bow for yourself, more than likely you will be the only one shooting it. Put one in someone else's hands and more than likely they will shoot it, all of their friends, cousins and distant relatives will shoot it as well. Before you know it KABOOM, and you are in the shop making a replacement.
Just a few realities of selling bows. I have never had to replace a bow I gave away(repaired a few) or donated for a charity auction.
